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Top 10 Worst Captchas

By John | February 16, 2008

Don’t you just love Captchas? CAPTCHA is an acronym for “Completely Automated Public Turing Test.” Completely Automated Public Turing test to tell Computers and Humans Apart.” I just call them PITA (pain in the ass). Here are my top 10 worst Captcha’s ever.

From best to worst:

10th Worst

9th Worst

8th Worst

7th Worst

6th Worst

5th Worst

4th Worst

3th Worst

2th Worst

The Worst

No Country for Old IT Guys

.

Phony PHD’s – Wasup

.

other silly stories

Topics: captcha, other, sillystory | 241 Comments »

241 Responses to “Top 10 Worst Captchas”

  1. Cote' Says:
    February 17th, 2008 at 1:33 pm

    I think this all means that the terrorists have won.

  2. When Captcha is Really, Really Bad| Zoli’s Blog Says:
    February 28th, 2008 at 7:29 am

    [...] Update (2/28):  A hilarious collection of the 10 worst captchas. [...]

  3. Charlie Says:
    February 28th, 2008 at 9:53 am

    Is that 6th one (the math problem) real, where is it from?

  4. ReallyEvilCanine Says:
    February 28th, 2008 at 12:47 pm

    Number 4 (or is it number 6?) — enter the letters which match the symbols — is most excellent. It’s easy to read, easy to comprehend, and difficult to do programatically, exactly what CAPTCHAs are meant to be.

  5. wef Says:
    February 28th, 2008 at 12:51 pm

    You’ve bought in to the Captchas Industrial Complex.

  6. ravi Says:
    February 28th, 2008 at 1:16 pm

    Charlie, sure, it’s real. See: http://brad.livejournal.com/2331278.html

  7. Steve Says:
    February 28th, 2008 at 1:53 pm

    Haha, number 6 is hilarious (answer: 7)

    Is number 9 in a different (non-greek-alphabet-based)?

  8. Harry Says:
    February 28th, 2008 at 2:45 pm

    The captcha is gonna be obsolete one day. It’s just too annoying.

  9. jt Says:
    February 28th, 2008 at 2:49 pm

    That is one reason why the captchas on my site http://www.subbmitt.com are easier to read. Some sites you can’t even use them because reading the captchas is just too difficult.

  10. Tom Says:
    February 28th, 2008 at 2:56 pm

    the answer to the math problem is 0. It says so in the equation….

  11. InStigAtor Says:
    February 28th, 2008 at 3:04 pm

    The math “challenge” (hah!) is from therandom.irb.hr/signup.php
    page which serves random data for statistical analysis. If you can’t evaluate that trivial expression in a few moments, there’s no way you could usefully make use of the site. In itself, a very reasonable request, but since plenty of programs can perform that evaluation, it fails to achieve the stated aim.

  12. AD Says:
    February 28th, 2008 at 3:18 pm

    The math-challenge is really not that terrifying. Though I wouldn’t know what to put in there… probably ‘infinity’ or ‘undefined’ since it features a division by zero (Delta*x is in the denominator, thus because x=0, 0 is in the denominator, making the whole equation illegal. Well, at least in traditional mathematics)
    If it’s from some math-related site (which I suspect) this ain’t hard at all, but rather a nice example of a good captcha!

  13. babis Says:
    February 28th, 2008 at 3:34 pm

    it for real:
    http://random.irb.hr/signup.php

  14. David Says:
    February 28th, 2008 at 3:50 pm

    I would have enjoyed this more if there was a link to the website where each one of these Captchas were found.

  15. adam Says:
    February 28th, 2008 at 4:21 pm

    i’d like to know where the math one is from too. the answer is 0, by the way…and that isn’t a partial derivative :)

  16. Youtube lover Says:
    February 28th, 2008 at 4:46 pm

    These days you can spent more time trying to figure out captchas then typing the actual comment.

  17. James Says:
    February 28th, 2008 at 4:50 pm

    I hate these stupid inventions. Screw the spammers!

  18. GoingLikeSixty Says:
    February 28th, 2008 at 5:22 pm

    Very well done.
    I try to make the best out of blogger word verifications by making up meanings or explaining what the “acronym” really means after I comment.
    @Charlie: ((( shaking head )))

  19. Haha! Says:
    February 28th, 2008 at 5:36 pm

    Haha i like that last one. i didn’t get it at first

    and as for the 4th one who are they trying to keep out with that??

  20. Chris Says:
    February 28th, 2008 at 5:38 pm

    CAPTCHA does not stand for “Completely Automated Public Turing Test.” That would be CAPTT.

    CAPTCHA stands for “Completely Automated Public Turing test to tell Computers and Humans Apart.”

    You were close, but please check your facts before posting your blogs.

  21. Xan Gregg Says:
    February 28th, 2008 at 5:42 pm

    The math challenge is at http://random.irb.hr/signup.php, a service for a stream of truly random bits. It’s appropriate for the audience.

  22. Jake Stride Says:
    February 28th, 2008 at 5:44 pm

    Yes it is, I have seen that one before but it made me smile again. It’s from http://random.irb.hr/signup.php

    I think the first one is my favourite though.

  23. John Says:
    February 28th, 2008 at 5:56 pm

    Chris,

    I have made the correction. However if you are looking for perfection you came to the wrong place… :)

    Thanks
    John

  24. John Says:
    February 28th, 2008 at 5:58 pm

    FYI…

    Some comments were lost because I had to switch servers due to all of the traffic today. Sorry to anyone who lost a comment.

    Thanks
    John

  25. CharlieSalazar.com/Blog » Blog Archive » Top 10 Worst Captchas | John M Willis ESM Blog Says:
    February 28th, 2008 at 6:04 pm

    [...] Top 10 Worst Captchas | John M Willis ESM Blog [...]

  26. doug w Says:
    February 28th, 2008 at 7:32 pm

    The capchas at http://www.floort.com are easy to read. Why does making them hard for a human to read make them any tougher? Good examples of programmers running amuck.

  27. Ebb and Flow | John’s Crawlspace Says:
    February 28th, 2008 at 11:29 pm

    [...] and I thought that was a shitty deal, but now I’m actually not sure which one would be worse. Either way, it’s stuff like this that helps me realize that things could always be a whole [...]

  28. big c Says:
    February 28th, 2008 at 11:55 pm

    derivative of sin is cos

    cos ((7*0)-Pi/2)
    = cos (-Pi/2)
    = 0

    forget about what appears in front of the cos, it dont matter

    have a nice day

  29. AlanLe.net » links for 2008-02-29 Says:
    February 29th, 2008 at 3:28 am

    [...] Top 10 Worst Captchas | John M Willis ESM Blog (tags: captcha) [...]

  30. Cmitch Says:
    February 29th, 2008 at 6:26 am

    # AD Says:
    February 28th, 2008 at 3:18 pm

    The math-challenge is really not that terrifying. Though I wouldn’t know what to put in there… probably ‘infinity’ or ‘undefined’ since it features a division by zero (Delta*x is in the denominator, thus because x=0, 0 is in the denominator, making the whole equation illegal. Well, at least in traditional mathematics)
    If it’s from some math-related site (which I suspect) this ain’t hard at all, but rather a nice example of a good captcha!

    Are you being serious? That’s not a fraction at the beginning in the sense you’re using it in, that’s telling you to take the derivative of what’s inside the brackets following it. STOP TALKING LIKE YOU KNOW WHAT YOU’RE TALKING ABOUT!

  31. Rick Beckman Says:
    February 29th, 2008 at 8:02 am

    @ doug w — The easier a CAPTCHA is for a human to read, the easier it will be for character recognition software to solver them for the spammers.

    The more obfuscated the text of a CAPTCHA is, the less likely it will be for spammers to crack. However, that obviously creates a usability problem.

    Long-term spam fighting will not find its solution in character-recognition CAPTCHA tests, though I’m sure there are CAPTCHAs available already which are just as effective (if not more so) than the character-recognition variety.

  32. David Barredo » Los 10 peores Captchas Says:
    February 29th, 2008 at 8:17 am

    [...] dejo una lista de los 10 peores captchas vistos en Internet. Publicado el Viernes 29 de Febrero En la categoría: [...]

  33. Jay Kay Says:
    February 29th, 2008 at 9:09 am

    about number 6…

    the derivative with respect to x of sin (7x – pi/2) is
    7 * cos (7x – pi/2). Therefore the partial derivative with respect to x in the problem of captcha 6 is
    28 * cos (7x – pi/2). When x=0, the derivative also is zero as cos (-pi/2) is zero.
    and if x were, say, pi/2, the answer would be -28.

    So what appears in front of the cosine does matter. Just not in this case cause x happened to be zero.

    P.S. nice collection of bad captchas…

  34. Captchas : Benedikt Rieke-Benninghaus Says:
    February 29th, 2008 at 9:28 am

    [...] zum Beispiel ist wirklich sehr verrückt. Bei John M Willis gibt es die 10 schlechtesten Captchas zu sehen. Und genau das ist der Grund, weshalb ich immer eine [...]

  35. Derrick Kwa Says:
    February 29th, 2008 at 11:53 am

    I agree with the likes of Harry. As much as I understand the need to deter spammers, I think captchas isn’t the best way of doing it. Usability wise, they’re far too troublesome and annoying. I don’t have a better suggestion at the moment, but I do think we’ll eventually come up with a better way to deter spammers. We have to.

  36. Keren Dagan Says:
    February 29th, 2008 at 12:16 pm

    See what I had to prove posting to reddit:
    http://usingit.wordpress.com/2008/01/19/are-you-human-not-an-easy-question-to-answer-these-days/

    I know the pain. Isn’t it ironic today that it is harder for us proving our humnaity than to the machine that it is not? Looking for better solution:)
    Keren

  37. TELEVISION SPY VOYEUR Says:
    February 29th, 2008 at 1:59 pm

    Those are some pretty funky ones, the wikipedia one isn’t so bad.

  38. CAPTCHA - HardwareLogic Forums Says:
    February 29th, 2008 at 3:58 pm

    [...] CAPTCHA Here’s a roundup of some frustrating CAPTCHAs Top 10 Worst Captchas | John M Willis ESM Blog Quaker Oatmeal Squares Cereal is an important part of your life. aim: drewandnotu | yahoo: [...]

  39. Peter Says:
    February 29th, 2008 at 4:36 pm

    Photoshopped.

  40. hm,... Says:
    March 1st, 2008 at 2:00 am

    hey! numero uno! whats ur deal!!!!

  41. BlogBuzz March 1, 2008 » Webmaster-Source Says:
    March 1st, 2008 at 5:04 am

    [...] Top 10 Worst Captchas – Don’t make your Captchas like these ones! [...]

  42. Spilt » Top 10 Worst Captchas Says:
    March 1st, 2008 at 10:43 am

    [...] John M. Willis has ‘em. [...]

  43. Schreckliche Captchas - Netgestalter Blog Says:
    March 1st, 2008 at 11:29 am

    [...] überall und das nur weil ein paar Spammer, es nicht sein lassen können. Jetzt hat ein fleißiger Blogger ein paar besonders nervige [...]

  44. links for 2008-03-01 | Jonathan Coffman - Convergence Journalism Specialist and New-Media Evangelist Says:
    March 1st, 2008 at 3:25 pm

    [...] Top 10 Worst Captchas | John M Willis ESM Blog [...]

  45. Surf Four To Know More: Break Time (Fun) « Sam Ideas Says:
    March 2nd, 2008 at 3:57 am

    [...] Top 10 Worst Captchas: Are you feed up with all “Are you human???” test. Some ask to add two numbers and some ask you to enter the alphabets scribbled on the rusty image, all this make you feel irritated. Right? Author John Willis have collected such top 10 worst captchas, have a look at them. [...]

  46. Nam Says:
    March 2nd, 2008 at 4:46 am

    Heh, the only comment that shows he knows how to differentiate here is Jay Kay’s one, he even remembered the chain rule. Kudos Jay Kay; shame on you to Steve, Ad and big c! Nice captchas, i guess i’m not human. (-_-)

  47. Links of the Week (2008/09) :: cimddwc Says:
    March 2nd, 2008 at 10:49 am

    [...] Top 10 worst captchas (via BRB) [...]

  48. Chris Blalock Says:
    March 2nd, 2008 at 1:44 pm

    Meh 28*cos(7*x-pi/2), it’s just calculus :P

  49. » Top 10 Worst Captchas | John M Willis ESM Blog Webcreatives Says:
    March 2nd, 2008 at 1:51 pm

    [...] Top 10 Worst Captchas | John M Willis ESM Blog [...]

  50. Anon Says:
    March 2nd, 2008 at 4:27 pm

    I predict that within the next 10 years, advances in artificial intelligence (especially image recognition algorithms) will make it nearly impossible for a website to differentiate between a human user and a web bot.

  51. Mosso Saves My Bacon! | John M Willis ESM Blog Says:
    March 2nd, 2008 at 7:19 pm

    [...] referred to as the Slashdot Effect.  Last Thursday the meta-blog site called Reddit somehow put my Top 10 Worst Captchas on its top 25 first page.  By 9 am I had  7k views on that one blog.  By the end of the day I [...]

  52. big c Says:
    March 3rd, 2008 at 12:55 am

    shame on you Nam, nothing i said was wrong in my solution to the math problem. Jay Kay simply stated that evaluating the derivative at some other point might make the value in front of cos matter (so long as the equation does not resolve to some scalar multiple of cos(((2n+1)Pi/2)) where n is an integer). And even after what Jay Kay does say, his last statement is the same as mine. I apologize for skipping steps that i thought to be (and Jay Kay proved to be) pointless in this problem

    have a nice day

  53. rprebel Says:
    March 3rd, 2008 at 1:20 am

    I looked at the link to the blog with #6 in it, and there, x=2pi. That would at least give an answer…why’d you change it?

  54. rprebel Says:
    March 3rd, 2008 at 1:24 am

    I looked again, and there are other differences. So, I’m guessing you just didn’t want to give credit unless you had to, so you changed it just enough. Nice. Similar to a ‘sound-alike’ in the entertainment industry, but infinitely less necessary. Just credit your pics instead of going straight to Photoshop. It’s not like anybody’s gonna try and charge you royalties.

  55. Wwohn.com : Captcha alternatives Says:
    March 3rd, 2008 at 4:21 am

    [...] ten worst captchas. Thank you Webhypes for the [...]

  56. » Il captcha di google è stato aggirato…. Etechs Says:
    March 3rd, 2008 at 7:34 am

    [...] johnmwillis Tags: antispam, captcha, facezie, [...]

  57. Captchas are Annoying | myAvalon.ca Says:
    March 3rd, 2008 at 8:27 am

    [...] John Willis’ blog post pretty much sums up how irritating these things are. I can barely read any of them. I like the idea of some sort of skill testing question. One captcha on John’s page displays a math question. The answer is 0 but I have no idea why they made it appear so complex looking. It’s not like a bot is going to give up on a question that is too hard for it. A dead simple math question like 2+10 makes sense to me. [?] Share This [...]

  58. Ali Raheem Says:
    March 3rd, 2008 at 3:52 pm

    the answer is -4 :)

  59. alex Says:
    March 3rd, 2008 at 4:03 pm

    great great the math problem one, and yea its real, check the link somewhere above…

    omg, that proved i wasnt human, i coudnt make it!

  60. Charlie Says:
    March 4th, 2008 at 1:47 pm

    Well, i’m pretty sure a computer could figure out #6 way faster than I could.

  61. Top 10 peores Captchas | ConGadget | Gadgets, camaras digitales, reproductores mp3, ordenadores Says:
    March 4th, 2008 at 3:24 pm

    [...] Via [...]

  62. Alex Lenvik Says:
    March 4th, 2008 at 4:44 pm

    the answer to the math problem is 0 the zero dosent do any thing its calcus d over dx is derivative of and any # is zero unless it is imaginary straight line at the side depends on proffeser

  63. Alex Lenvik Says:
    March 4th, 2008 at 5:14 pm

    unless the line means integral. then answer is -4. the d/dx and the integral sign cancel out, simply making x=0. the seven disappears and it becomes 4sin(-pi/2), sin(-pi/2)=-1, 4*-1=-4. if this is real, then it would make more sense for a simple answer because it wouldn’t recognize “pi” as meaning pi. [as in; if the line doesn't mean integral, then 4sin(7x-pi/2)= 4cos(7x-pi/2)*7= 28cos(7x-pi/2), and i don't think the program would recognize that, compared to 28cos(7x-Ï€/2) or maybe even 28cosine(7x-Ï€/2)...]

  64. Tom Beaton Says:
    March 4th, 2008 at 7:48 pm

    Those are horrific. I hate captchas. People seem hell bent on making them near impossible to complete.

  65. FPM Says:
    March 4th, 2008 at 11:41 pm

    I used to be a homeless rodeo clown but since i started using captcha on my blog comments I am now a world class magician !

  66. NykO18 Says:
    March 5th, 2008 at 5:30 am

    You should try the one from the steampowered forums here : http://forums.steampowered.com/forums/search.php
    It’s almost impossible to read, and you must fill it each time you want to search something.

  67. BigJohn Says:
    March 5th, 2008 at 8:15 am

    This site is awesome. I’ve never seen some of these, but I’ve had some where I kept typing in the wrong code because I couldn’t tell if a character was a “0″ or an “O” or a “6″ or a “G”.

  68. Daily Links 06 Mac 2008 Says:
    March 5th, 2008 at 12:19 pm

    [...] Mail UK) The Origin of Your Favorite Video Game Friends – (Mental Floss) Top 10 Worst Captchas – (John Willis) Chantal Sebire begs French president for the right to die – (News AU) Sauron’s Kingdom – [...]

  69. Emma Says:
    March 5th, 2008 at 2:39 pm

    rprebel, the site has a range of math questions, many of the form above. You just didn’t get that one. A single question would be effective.

  70. John Smith Says:
    March 5th, 2008 at 2:43 pm

    If only web developers would realize… but these trends lag far behind

  71. Ryan Beesley Says:
    March 5th, 2008 at 10:36 pm

    rprebel, it’s a CAPTCHA. If it were always the same question you wouldn’t be “proving” that you were a human.

  72. Ryan Beesley Says:
    March 6th, 2008 at 12:07 am

    The best CAPTCHA I’ve seen, is what Hotmail uses. (This link may not work: https://hipservice.live.com/hipImageDirect.srf?id=68692&config=Hard8Char) The image is high contrast, but lines of the same stroke width and color as the foreground and background intersect over the CAPTCHA text. The result is an image that is still easy for a human to process but a computer will have a more difficult time at it. Too many CAPTCHAs I find rely on a busy background, but they use the same colored type every time for the CAPTCHA text. The extra colors and patterns in the background only serve to confuse humans, because unlike a computer, we cannot adjust our chromakey. A computer will just say, give me every pixel but black (assuming the text color in question is black of course).

  73. El Captcha definitivo « Carpe Blogem Says:
    March 6th, 2008 at 1:33 am

    [...] Captcha definitivo Publicado el Marzo 6, 2008 por Salva Top 10 Worst Captchas presenta una divertida selección de los peores Captcha que existen, o podrían existir. La [...]

  74. Valleywag.com | John M Willis ESM Blog Says:
    March 7th, 2008 at 7:04 am

    [...] an approval process before you can be allowed to make comments on their blog (I guess the ultimate Captcha) .  Com on guys, get off your pompous valley-high and let the rest of the world [...]

  75. Adam Says:
    March 7th, 2008 at 1:33 pm

    I have unfortunately realized from reading this article that I am, in fact, a robot.

    Dammit.

  76. links for 2008-03-08 at Alan Vonlanthen’s blog Says:
    March 8th, 2008 at 6:30 pm

    [...] Top 10 Worst Captchas | John M Willis ESM Blog (tags: security usability Funny captcha) [...]

  77. 7leads Says:
    March 9th, 2008 at 4:07 am

    It’s nice to see some of these. Now I know I’m not the only one that gets 75% of them wrong.

  78. m@koomba Says:
    March 9th, 2008 at 10:12 am

    This Captcha wasn’t cretaed against bot but against people :D

  79. Webparade - Il meglio del Web » Blog Archive » Iscrizioni Says:
    March 10th, 2008 at 1:59 am

    [...] Quanto ti iscrivi ad un sito e devi copiare le lettere, a volte sono impossibili, alcuni esempi [...]

  80. mehmet Says:
    March 10th, 2008 at 9:52 am

    This site is awesome. I’ve never seen some of these, but I’ve had some where I kept typing in the wrong code because I couldn’t tell if a character was a “0″ or an “O” or a “6″ or a “G”.

  81. 10 worst Captcha you might have never seen Says:
    March 10th, 2008 at 10:48 am

    [...] More read more JohnmWills 10 worst Captcha   (No Ratings Yet)  Loading … |  Email This Post | Click to save [...]

  82. Laura Says:
    March 10th, 2008 at 12:45 pm

    Hee hee, this made me laugh. Seems even some sites have “machines scanning for machines” these days, and if you are not careful to randomize your actions, you may be penalized for being a machine, that is, at least for mimicking machine-like behavior.

  83. Anand Says:
    March 10th, 2008 at 1:26 pm

    LOL…great post. That’s why I love Google. Their CAPTCHAs(on gmail and orkut) are the easiest to read.

  84. Prasanth Says:
    March 10th, 2008 at 11:49 pm

    Horrible! Lol.

  85. luq Says:
    March 11th, 2008 at 6:14 am

    never knew that captchas could get this far,,the math one is crazy!

  86. Zander Erasmus | Student Advice Blog Says:
    March 11th, 2008 at 7:15 pm

    omg XD horrible… i also hate these emensely
    too bad that these are so neccesary, maybe if people just stopped trying to use bots, then we wouldn’t have to resort to stuff like this

    and i agree, the math one is just crazy XD absolutely crazy

  87. Nima Hejazi Says:
    March 12th, 2008 at 11:46 am

    At least captcha can stop many spammers.

  88. JT Says:
    March 12th, 2008 at 5:51 pm

    Someone should create a program that can fill in CAPTCHAs automatically so that real people don’t have to do this crap.

  89. MiramarDesign Says:
    March 12th, 2008 at 9:35 pm

    I love the captcha that actually translates books and has whole words b/c if you can’t understand one single letter you can at least reference it from the words.

  90. Jason McLaughlin Says:
    March 12th, 2008 at 10:24 pm

    Great selection of unreadable bullcrap! I hate these things, and can’t wait for the new solution to come along.

  91. nitro2k01 Says:
    March 13th, 2008 at 8:31 am

    Ok, I’ll give you my comments on these:

    Wikipedia: A once in a lifetime thing, but it’s bound to happen.
    Tight letters: Bad luck… Doesn’t even make it much more difficult for robots. It’s a Google captcha though, so you may just click the handicap button and have them read for you.
    Symbols: I actually think that captcha looks really good! It’s not too hard for a human but nearly impossible for a robot that isn’t specialized on that one.
    Drawn over letters: Just horrible.
    Math: This is probably a protection against some humans as well. I mean, assuming this is a math forum, they don’t want people to come in and ask silly question like how to integrate f(x)=e^(x^2)
    Graffiti style: Ewww!
    Bad contrast: I can read that one. But if I couldn’t I could just open it in Photoshop and extract the code. And if Photoshop can do it, so can a robot… Fail!
    Glyphs: Hmmm? What’s this? Sanskrit?
    Grey blur: Just very horrible.
    Loading image: Oh, that on will load in time. Be patient.

    To finish it up, here’s my own submission:
    Pigrape!

  92. Top 10 de los peores Captchas | Isopixel Says:
    March 13th, 2008 at 12:56 pm

    [...] John M Willis ESM Blog Publicado 13 Marzo [...]

  93. 170k Views in 30 Days | John M Willis ESM Blog Says:
    March 13th, 2008 at 1:34 pm

    [...] stupid post has received over 170k views in just 30 days.  Yikes. I’ll take obviously, however I would [...]

  94. Los diez peores Captchas que haz visto Says:
    March 13th, 2008 at 3:35 pm

    [...] Los diez peores Captchas que haz vistowww.johnmwillis.com/other/top-10-worst-captchas/ por turl hace pocos segundos [...]

  95. Los 10 peores captchas de internet | 5líneas Says:
    March 13th, 2008 at 3:47 pm

    [...] ha hecho hasta gracia ver uno de estos 10 peores captchas de la web. Concretamente el de resolver la fórmula matemática, una derivada, como si todo el mundo supiera [...]

  96. CAPTCHAs: enemigos o aliados? « Multa de un crédito por violación del estatuto de moralidad escrita. Says:
    March 13th, 2008 at 6:19 pm

    [...] Vía John [...]

  97. I thought I was the only one who had trouble reading CAPTCHAs | NWI Blogs Says:
    March 13th, 2008 at 8:44 pm

    [...] John M. Willis has a gallery of the 10 worst CAPTCHAs on the internet. [...]

  98. (((NA))) Says:
    March 13th, 2008 at 10:05 pm

    Lmao

    FAIL

  99. ¿Qué ocurre cuando no entiendes un ‘captcha’? | Tecnobot Says:
    March 13th, 2008 at 11:27 pm

    [...] mucho peores que el que acabo de mostrar. Mientras escribo este artículo, me encuentro con “Top 10 Worst Captchas“, de John M Willis. A continuación varios ejemplos de los peores captchas, sacados de su [...]

  100. Antonio Bustamante Says:
    March 13th, 2008 at 11:36 pm

    Guys, for number 6 (the derivative captcha), the answer is simply 0 (zero).

    Explanation:

    4 is a constant, so you leave it untouched. Derivative of sine is cosine and derivative of the inside of the sine is simply 7. 4 x 7 is 28.

    Therefore, we end up with 28cos(7x – pi/2). Since we want to find derivative at x=0, we have that the derivative will be 28cos(-pi/2). The cosine of -pi/2 is 0 (zero), so the final answer is ZERO.

    Great post, by the way. Great examples :-D

  101. duhu Says:
    March 14th, 2008 at 2:20 am

    Hard capthas!!

    http://www.juzamdjinn.blogspot.com

  102. Top Ten – Los peores Captchas de la Web Says:
    March 14th, 2008 at 7:42 am

    [...] Visto en Johnm Willis [...]

  103. Kaira Says:
    March 14th, 2008 at 9:27 am

    Wow, great ones, I agree with #4, the one with the symols and the “translation” is great for the pourpose Captchas are. And answering to #100, ok, the calculation was not too complicated, direct solution, but first, not averyone can solve this, and second, what u get from solving it must be a really good thing!! if it’s not… I’m sure I would never waste time calculating this, and probably I’m not the only one.

  104. Mxkro Says:
    March 14th, 2008 at 9:02 pm

    Realmente, muchas veces los captchas llegan a ser muy molestosos, pero algunos de èstos son tan indecifrables que quizàs si me topo con uno de ellos, pues preferirìa cambiar de pàgina, y si es muy necesario, pues… igual cambiar de pàgina, porque menos mal existe informaciòn por otros lados… :D … saludos!!!

  105. Los diez peores Captchas que has visto « Bitácora de un perdedor Says:
    March 14th, 2008 at 10:21 pm

    [...] Aquí para ver los otros 9 [...]

  106. Captcha solo para ingenieros | El blog de alexs! Says:
    March 15th, 2008 at 3:06 pm

    [...] molestos elementos de la web 2.0, en el blog de John M Willis encontré un post donde muestran el Top 10 de los peores Captchas y yo tomé el que más me gustó y por eso el título, me refiero a [...]

  107. Wwohn : Captcha alternatieven en varianten Says:
    March 17th, 2008 at 11:57 am

    [...] Kijk ook verder in het berichtje over de 10 slechtste captchas. [...]

  108. brighton seo Says:
    March 20th, 2008 at 8:25 am

    ha ha… this is excellent..

    Captchas can be the best and worst parts of website site ownership / usibility.

    Thanks for sharing.

    Si

  109. Dan Says:
    March 20th, 2008 at 8:53 am

    You forgot this one…

    http://www.nytimes.com/2007/06/11/technology/11code.html

  110. Corey Smith’s Business and Technology Blog » CAPTCHA Says:
    March 20th, 2008 at 4:22 pm

    [...] John points us to a list of the worst CAPTCHAs found on the web. If you find worse, let me know. Here they go: [...]

  111. Favorite StumbleUpon links of the week Says:
    March 20th, 2008 at 10:45 pm

    [...] 2.0 workplaces [PICS] РUADDit Instrucciones para cuidar un beb̩ & makememinimalTop 10 Worst Captchas | John M Willis ESM BlogFunny Shit: Bad Domain Names Free Fandango Movie Ticket101 Five-Minute Fixes to Incrementally [...]

  112. Leo Piccioli Says:
    March 21st, 2008 at 7:56 am

    The best of all is that they will continue to get more difficult!!

  113. 10大能把人逼疯的CAPTCHA | SilenceWolf Says:
    March 23rd, 2008 at 1:39 am

    [...] 关于Captcha,也就是注册时经常让你辨识的文字或者图案,我们已经介绍过两次了,都是关于机器如何识破它们的,这篇和这篇。也正因如此,人们才把captcha设计的越来越难以辨认,大有不把人逼疯不罢休的劲头。下面是John总结的10大最糟captcha,由稍好到差这个顺序排列。(真不幸,我也碰到过好多) [...]

  114. ¿Te apetece registrarte? Says:
    March 24th, 2008 at 7:32 am

    [...] invito  a que echéis una ojeada al post que publican en Jhon M Willis ESM Blog sobre este [...]

  115. Captchas | Virtual Positiveness Says:
    March 24th, 2008 at 1:50 pm

    [...] Some Captchas are really unreadable, some Captchas are difficult to solve quickly, and people try three or four times to get it done. But don’t forget blind users, using screenreaders : nowadays, websites implement alternatives to written Captchas like audio versions – just take a look at Windows Live (Hotmail). [...]

  116. Die schlimmsten Captcha-Überprüfungen | dacblog Says:
    March 25th, 2008 at 5:11 am

    [...] M Willis hat in seinem Blogeintrag die 10 schlimmsten Captcha-Überprüfungen gesammelt. Viel Spass [...]

  117. How to Generate 100s of Backlinks in Minutes « // Internet Duct Tape Says:
    March 25th, 2008 at 4:47 pm

    [...] ZDNet, you have a captcha worse than Typepad (and that’s saying a lot). No wonder the conversation is leaving the [...]

  118. Subnetmask - das Blog » BlogArchiv » Links [26.03.2008] Says:
    March 26th, 2008 at 4:56 am

    [...] Top 10 worst Captchas [...]

  119. Nik Chankov Says:
    March 27th, 2008 at 12:09 pm

    Well, up to my experience as developer I am limiting my Captcha to 3 or 4 characters and hopefully they are a logical word i.e. “word”, “lord”, “nerd” etc.

    I think even 10-20 images stored and linked to some words /without random generation/ are enough to determine human.

    Anyway, really nice gallery with captchas :)

  120. Most Annoying Captchas - Ever |PinoyTux Weblog Says:
    March 27th, 2008 at 4:36 pm

    [...] So, if you want to check the most annoying captchas out there, check out John M Willis ESM Blog [...]

  121. What is so hard about making the conversation easy | WinExtra Says:
    March 28th, 2008 at 3:03 pm

    [...] Eric says in his post Congradulations ZDNet, you have a captcha worse than Typepad (and that’s saying a lot). No wonder the conversation is leaving the [...]

  122. Sobre Captchas — tikitaka.ebierzo.com Says:
    March 29th, 2008 at 5:44 pm

    [...] Los hay de miedo. Comparte esta entrada. These icons link to social bookmarking sites where readers can share and discover new web pages. [...]

  123. Los peores CAPTCHAS | gEEK tHE pLANET Says:
    March 29th, 2008 at 10:25 pm

    [...] Más: Top 10 Worst Captchas Troll [...]

  124. Thales Says:
    March 30th, 2008 at 12:06 pm

    eu odeio captchas

    Abraços

    Thales
    http://lista10.org

  125. Captcha-uri neinspirate | CNET.ro Says:
    March 30th, 2008 at 1:00 pm

    [...] operaţii online. Nu în toate cazurile aceste captcha-uri sunt inspirat alese. Câteva mai jos (via), cu observaţia că cel puţin cea "matematică" trebuie că este la [...]

  126. vexorian Says:
    March 30th, 2008 at 6:48 pm

    “but since plenty of programs can perform that evaluation, it fails to achieve the stated aim”

    I would say the challenge is presented as an image, so it is still a big problem for bots.

  127. Forms, Spam, Captchas Says:
    March 30th, 2008 at 11:35 pm

    [...] difficult to crack than the one I am currently using. In the search I came across a list of the Top 10 Worst Captchas. These are were all a little extreme, but would definitely do the job. I doubt I would get any [...]

  128. Wendel Says:
    March 31st, 2008 at 8:47 am

    São muito fáceis.
    Vocês tem que pensar um pouco mais

  129. Falando em bytes » Blog Archive » CAPTCHA? Teste de Turing? Says:
    April 1st, 2008 at 4:38 am

    [...] cuidado com seus CAPTCHAS, um blog fez uma coletânia dos 10 piores CAPTCHAS do [...]

  130. Os piores captchas… « Coisa Séria Says:
    April 1st, 2008 at 10:33 am

    [...] para acessar alguns serviços da internet confirmando que somos humanos, e não meros spans… essa lista foi bolada com os piores captchas [...]

  131. rascunho » Blog Archive » links for 2008-04-01 Says:
    April 1st, 2008 at 3:40 pm

    [...] Top 10 Worst Captchas | John M Willis ESM Blog Don’t you just love Captchas? CAPTCHA is an acronym for “Completely Automated Public Turing Test.” Completely Automated Public Turing test to tell Computers and Humans Apart.” I just call them PITA (pain in the ass). Here are my top 10 worst Captc (tags: http://www.johnmwillis.com 2008 mes3 dia1 at_tecp CAPTCHA top10 accessibility) [...]

  132. Daily Bookmarks 04/01/2008 « Experiencing E-Learning Says:
    April 1st, 2008 at 7:03 pm

    [...] Experiencing E-Learning Building Experiences through Instructional Design and E-Learning « Daily Bookmarks 03/31/2008 Daily Bookmarks 04/01/2008 April 1, 2008 Top 10 Worst Captchas | John M Willis ESM Blog [...]

  133. Top 10 Worst Captchas « Observations from tech’s lighter side…. Says:
    April 2nd, 2008 at 3:35 am

    [...] read more | digg story [...]

  134. captchap | unbunt Says:
    April 2nd, 2008 at 1:55 pm

    [...] captchap Mittwoch, April 2nd, 2008 @ 18:55 | Allgemein top-10-worst-captchas [...]

  135. ConTrust » “Bad” CAPTCHA Says:
    April 3rd, 2008 at 2:27 am

    [...] And Just to make it ammusing, here are the top 10 worst CAPTCHA ever, click here [...]

  136. Jekylla Says:
    April 3rd, 2008 at 2:37 am

    What a great collection :-)

  137. Jaimz Says:
    April 5th, 2008 at 6:51 pm

    I don’t understand your problem. It is all perfectly straightforward to me. What can’t you understand? I start school next week so please address queries to my dad.

  138. Kaum zu lösen Says:
    April 7th, 2008 at 2:59 am

    [...] sind manche von ihnen so konzipiert, daß sie auch vom Menschen kaum zu lösen sind. Die “Top 10 Worst Captchas” zeigt die [...]

  139. Jach Says:
    April 7th, 2008 at 8:25 pm

    Wow, lots of confusion on the simple math problem. It’s been explained before, but I’m bored, and don’t want to do my advanced calculus at the moment, so…

    d/dx (4 * sin(7x – pi/2) )
    Rewriting…
    d/dx (-4 * cos(7x) )
    28 * sin(7x) | x = 0
    28 * 0 = 0

    In any case, the captchas I use go something like this:
    What starts with bow and ends with ser?

  140. rpgfan3233 Says:
    April 13th, 2008 at 2:58 pm

    LOL I just went to the actual site with the math CAPTCHA. Here is what I got:
    d/dx [4], where x=PI

    Well the derivative of any constant is 0, so obviously the answer to that was 0. :P

    Then I got a different one:
    d/dx [3 * sin[PI/2] ], where x=PI
    Obviously, there is not an ‘x’ to be found, so I guess the answer is again 0.

    In other words, if you see a d/dx [?] problem, and it doesn’t have an ‘x’ to derive, then the answer is always 0. Note that the trick only works for the d/dx problems. I tried a few times more and finally got a decent problem:
    d/dx [4 * cos[6 x - PI / 2] ], where x=2*PI

    The answer is -1, if I worked it out correctly (chain rule and all).

  141. Os 10 piores Captchas » Blog do Ailton Says:
    April 16th, 2008 at 12:53 pm

    [...] Muito Legal que eu vi no Blog John Wills. [...]

  142. s4motny Says:
    April 16th, 2008 at 2:37 pm

    its getting worst and worst whit thous things

  143. chulini Says:
    April 19th, 2008 at 1:49 am

    whahahahaha OMG!!!

  144. ConTrust » “Bad” CAPTCHA Says:
    April 19th, 2008 at 8:57 am

    [...] And Just to make it ammusing, here are the top 10 worst CAPTCHA ever, click here [...]

  145. Top 10 de los peores CAPTCHAS - Nocturnabsas.com.ar Says:
    April 22nd, 2008 at 10:50 am

    [...] Top 10 de los peores CAPTCHAS Ahora que a los se

  146. Hammad Says:
    April 23rd, 2008 at 11:12 am

    great find…

    man thats CAPTHSUCKS

  147. JokesBoy Says:
    April 24th, 2008 at 7:22 am

    The maths one is horrifying, I feel like giving up maths when I see these sine, theta etc.

  148. zielona jaśminowa » CAPTCHA z naszego podwórka Says:
    April 27th, 2008 at 4:27 pm

    [...] sieci można znaleźć mnóstwo zestawień najgorszych CAPTCHA (np. Top 10 Worst Captchas, brakuje jednak czegoś co pokazywałoby źle wykonane CAPTCHA na polskich stronach. Znalazłem [...]

  149. Die zukünftigen Rapidshare Captchas « Rapidshare, Katzen, Doch, Captcha, Norris, Minuten, Chuck, Captchas « Freetagger.com Says:
    April 28th, 2008 at 2:33 pm

    [...] zählen, doch wie gesagt die Zukunft sieht “rosig” aus. Im übrigen findest du hier weitere schlimme [...]

  150. greta Says:
    April 28th, 2008 at 6:08 pm

    it’s just first-year calculus, man… you need the chain rule to take the derivative w/respect to x, then evaluate the deriv. at x=2*Pi

    (7)(6)cos(6x) – (4)(7)sin(7x + Pi/2)

    for x=2*Pi

    42 cos (12*Pi) – 28 sin (14*Pi + Pi/2)

    42 (1) – 28 (1)

    42 – 28 = 14

    finally… a use for calculus in daily life (LOL)

  151. BLOG E-COMMERCE de François Ziserman » Archive du blog » La valse des Captchas Says:
    May 1st, 2008 at 2:50 am

    [...] sur http://www.johnmwillis.com/other/top-10-worst-captchas/ via [...]

  152. Me cuentas » Blog Archive » Los 11 peores Captchas de la historia Says:
    May 1st, 2008 at 4:09 pm

    [...] Via johnmwillis [...]

  153. Jamal Says:
    June 5th, 2008 at 2:32 am

    I swear to god. no one is doing the math problem correctly. :P

    As a great man once said, when differentiating functions. Take the derivative of the outside (the enclosing function), leave the inside alone, then take the derivative of whats inside.

    d/dx 4 sin (7x -pi/2) |x=0

    This means to evaluate the derivative (the slope of the function) at the point x=0.

    d/dx 4 sin (7x -pi/2) |x=0
    4 d/dx sin (7x -pi/2) |x=0
    4 cos(7x -pi/2) *7 |x=0
    28 cos(7x -pi/2) |x=0
    28 cos(-pi/2)
    28 * 0
    0

  154. SamuraiDio » Quando usar e quando não usar um CAPTCHA? Says:
    June 9th, 2008 at 1:28 pm

    [...] Willis postou em seu blog os 10 piores CAPTCHAs. Vou exibir alguns dos melhores piores [...]

  155. Tom - StandOutBlogger.com Says:
    June 24th, 2008 at 7:37 am

    I hate the ones that you cant even read! You are sitting there straining for ages, and then you get it wrong and have to try again.

  156. GRINDSTONE MEDIA » Blog Archive » everybody loves a captcha Says:
    July 14th, 2008 at 7:18 am

    [...] Willis had a great post: The 10 Worst Captchas, go have a laugh, you won’t believe how outrageous they are. Posted by Ryan Wild Filed in [...]

  157. John Says:
    July 14th, 2008 at 3:55 pm

    Hi,
    Nice collection. I thought it is good to add about a Free CAPTCHA service located at
    http://www.brains-n-brawn.com/Comment/default.aspx?article=aicaptcha

    Developer says they created this CAPTCHA by trying to two targets, 1. a good Spam protection, 2. Should not be a pain for humans. and Seems they are on a good place with 1.2 million CAPTCHA prints in just last 6 months! see yourself by creating a account and adding a site using IE.

  158. WebNobbis Blog ~ Meinungen ~ Informationen ~ Spaß » Nie wieder Spam! « Says:
    July 23rd, 2008 at 5:16 am

    [...] Zufall bin ich auf einen Beitrag gestoßen, der sich mit den 10 schlechtesten Captchas beschäftigt. Ich glaube, sowas wie die Mathe-Aufgabe führe ich auch mal ein [...]

  159. –no name– » Blog Archive » Captchas sind jetzt wohl geknackt — bis auf: Says:
    July 23rd, 2008 at 9:13 pm

    [...] Die Zehn schlimmsten Captchas, wobei ich das mit der Ableitung recht cool finde…wir wahrscheinlauch auch diese Leute abhalten, zumindest eher als die Buchstaben Captchas, die somit ja obsolet sein dürften, wenn es jetzt eine heerschar Leute gibt die jetzt quasi Gratis Captchas ausfüllen. [...]

  160. No Country for Old IT Guys | IT Management and Cloud Blog Says:
    July 24th, 2008 at 10:00 am

    [...] Top 10 Worst Captchas [...]

  161. My Top 3 posts of all time | IT Management and Cloud Blog Says:
    July 24th, 2008 at 12:51 pm

    [...] Top 10 Worst Captchas [...]

  162. Mitsumoto Says:
    July 25th, 2008 at 1:55 pm

    I don’t understand why we who use the web properly have to be authorized because of some bad guys!

  163. Codexon — Recaptchas - Internet Torture Says:
    August 12th, 2008 at 2:31 pm

    [...] http://www.johnmwillis.com/other/top-10-worst-captchas/ X [...]

  164. Aby Says:
    August 25th, 2008 at 9:39 pm

    Captcha is a tool to distinguish between human and automated programs. Unfortunately most of the captcha are a burden to users. An ideal captcha should be easily readable to human and rarely understandable to hacker applications. I have created such a captcha and published in my blog. I have a plan to establish it as a service. I.e. you can include it as a plug-in to your web site. Please give your valuable comments regarding this.
    http://www.codegeeks.net/captcha-using-aspnet

  165. MiniNoticias » Blog Archive » Top 10 de los peores Captchas Says:
    August 26th, 2008 at 4:39 pm

    [...] Vía John M Willis ESM Blog [...]

  166. Top 10 Lists Says:
    August 30th, 2008 at 1:55 am

    This is why I hat Captchas so much. But at least now I can laugh about it.

  167. CAPTCHA’d « A zijn Says:
    August 30th, 2008 at 3:45 am

    [...] dat mensen geautomatiseerd duizenden e-mail adressen registreren, zijn veel sites voorzien van een CAPTCHA. Een plaatje dat dusdanig is verhaspeld dat de veronderstelling is dat (voorlopig) een mens het wel [...]

  168. Food wordpress themes Says:
    August 31st, 2008 at 3:07 pm

    great collection

  169. fulano Says:
    September 6th, 2008 at 3:17 am

    Don’t forget rapidshare, one of the worst

  170. Riyanne Says:
    September 6th, 2008 at 5:30 am

    Haha! Those are funny looking captchas!

  171. Пуштај, нисам ја компјутер! | Peđina beležnica Says:
    September 10th, 2008 at 4:56 pm

    [...] na kraju, i nekih primera, koje sam našao na blogu Džona M. Vilisa, istražujući ovu pojavu. Njega je problem očigledno dovoljno zainteresovao da je čak sačuvao [...]

  172. Fenomenal » Blog Archive » När Captchas goes bad… Says:
    September 12th, 2008 at 5:56 pm

    [...] förvridna teckensträngen, för att bevisa att man inte är en bot för någon obskyr applikation. Den här samlingen captchas filtrerar bort både människor och [...]

  173. Rien ne se perd, rien ne se crée | Comme une image Says:
    September 17th, 2008 at 11:34 am

    [...] l’avait raté, je vous rappelle l’existence de cet hilarant billet (en anglais) sur les 10 pires Captchas du monde. Pas [...]

  174. CyberElla Says:
    September 22nd, 2008 at 4:03 am

    I ALWAYS fail VBulletin forum’s search captchas – it must be they, right? I don’t know what’s wrong. In the coding? The images aren’t always that bad.

    I feel like a robot, sometimes, because I am often generally poor to deal with captchas.

  175. Fritteritter Says:
    September 27th, 2008 at 1:16 pm

    Here’s a fantastic CAPTCHA that I just found in the requirements to join a programmer’s newsgroup:

    -
    Nobody in their right mind likes spammers, nor their automated assistants.
    To open an account here, you must demonstrate you’re not one of them.
    Please spend a few seconds to try to study the number (integer) in this box:

    /——————————————————————————\
    I9UDWGTYOM4HQ5MWCFYE11XP6IVY68HMQ201FRXRHI6QEWL55395TWUQWRFT7I7VKBX7PK4J2ROM3I5T
    Y0OB38MLR6YYKU58QG5ZYZQ31EPJTIP4N9MEXIVEY1JOK17L7BCF27LUOBRMOF4DRRFHTTINLIDPS4FE
    SO8T6JZ3R1H6L9DQDVZIR5RGK3YVEVZKOVCHVBHR90ILBH2TQBUPHSM2BNIXVET2D1GIAMG2RDA7DLMJ
    E4J4MCDHPQRLJILLWM4RTVR1VV3PAK54WGL2WTHHYXRKB1RHOCTWK2JOXRK4R7EMF1VGMHG0323H5TM9
    9EJMCNG9AXUN0GXA0VX0PMWU18XEHX84G9YSZMK5K5UYKUHBZ019QW65W8LL0YSELB0KSM7UKL1KC723
    ALXQ0VZS0MC366E1PRKVLZCPDH869872VK6XCHB23YTJDBW90RNOUWCMO1PQQUMMONQ7J7DTOEOU3AD7
    TUG2TLLLXJVQ3RT4HRBKJALC38M7Y170RHM7O7EV5JE0CSR6H8FP9RPTFLYO1B7W2QTJCEIDJF1RNQ87
    JUSRFP9MQWU663ETUTB7UJPNZNFNN22KSMXQ87ZBQJJF12GE5ZOFB174E0C8JZST6TWDK2ALE4KGIXKM
    8YTU3MBR04DW0BI063GFKC299KY35EDWVC72MKJKAAT06W446DTJYT3V5VB9UF4F69WUJKF0RV8VQ57F
    W04AK5UYU6KBKV5F3HCCVCC9LHTEEXEOVZ8NFBGOEJX6A5ZEZJYR8CR50S8PKIJX0SMI03P9H9NPJKFK
    DS6S3MYN77P1ZPNFO3ZG2PD21M37CVFHKSUGB35IH542DLEG54AWIYC99O6IV2MOTC4MUBYMNO4OSFKJ
    FDOKSE8PLXHNWXF6VKP5TDN0YWUZWCQTCZFX3765O5I797I9U3JCJN4ZB3II4194EB84S4XFQ45X7P54
    0ATCAYBD03D6VVBBEJBYIG3F57ID9LH7CTL2488RON1KKJ88VQ5LQP7HIKIIMCWS5RJC8VU7Y5Q3WEPB
    PR5K7MRWKCXFQGBQEN7LMQDO4HZCTQM008SGIJMZ05WHW0P0ILKHVNO30C8Q3XE58TXOCBNNLCQCP69K
    IFLL6D2MJMXR1RTD39ABT2IAXXCFWZEB77N234AKJWLWUU5XU0N6N5GKXUMAUTI203ZC1CQ815YT9D54
    4GLWEFLVIGEVWIYT5CGWEBZ0VSTR8ZH7T070JI2YHALSOT033VW639IL69MDHXMRUI5EF9CRQEX0UKG8
    IDUER2X25F5JURIW7X0AZZ33FOI33GCDWDDH3LHDREHPBH7AK514FUGC1L48UMHVR5AH5ZHEOFTAQFBL
    IYP7TUPMX6DHZKVMY7DBH096CSHSZY3W7J228DS74000000000000000000000000000000000000000
    00000000000000000000000000000000000000000000000000000000000000000000000000000000
    00000000000000000000000000000000000000000000000000000000000000000000000000000000
    00000000000000000000000000000000000000000000000000
    \——————-(Generated by CMUCL just today)—————————-/
    (You don’t need JavaScript or images to see that CAPTCHA!!
    You just need to copy the text into a text editor, delete the
    line breaks, then feed it to software you write to analyze it.)

    Then try to succinctly explain the significance of that number
    within the confines of this TextArea:
    +————————————————————+
    | |
    | |
    | |
    +————————————————————+

  176. » Using captcha without displaying it — Vile Works Says:
    October 1st, 2008 at 4:06 pm

    [...] sucks. For more information on how much captcha can suck see John Willis’ post Top 10 Worst Captchas. But at the same time it can be really annoying for webmasters to have their forms unprotected with [...]

  177. York and stuff » A note on blog spam Says:
    October 3rd, 2008 at 3:40 am

    [...] Automated Public Turing test to tell Computers and Humans Apart”.  Sometimes this gets pure silly. And the bad guys are close on the heels of such [...]

  178. September Roundup! | IT Management and Cloud Blog Says:
    October 3rd, 2008 at 9:52 am

    [...] Top 10 Worst Captchas [...]

  179. dustbury.com » OED please note Says:
    October 26th, 2008 at 6:07 pm

    [...] And while I still wince at these things, I have to acknowledge that they could be a whole lot worse. [...]

  180. Mark S Says:
    October 31st, 2008 at 6:28 am

    You do not need captchas to protect your site’s forms. Plain html and no jscripts will do.

    The only thing you achieve by using captchas is to make your site’s pages with forms unfriendly to your human visitors.

  181. October Roundup | IT Management and Cloud Blog Says:
    November 2nd, 2008 at 4:28 am

    [...] Top 10 Worst Captchas [...]

  182. Walt Ribeiro Says:
    November 2nd, 2008 at 11:15 am

    This is great. I’m having a tough time trying to answer a few of these to post comments on my Youtube channel and thought it’d be funny if anyone else has these same issues. Hilarious :)

  183. Pixel Utile » Blog Archive » Les 10 pires Captcha d’Internet Says:
    November 10th, 2008 at 11:00 pm

    [...] sur Jhon M Willis ESM Blog Tags: [...]

  184. Patricia Says:
    November 11th, 2008 at 3:17 pm

    The math challenge would not be that terrifying ONLY if you know about integration and derivation… otherwise, that chapta is annoying and ridiculous ¬¬

  185. Banana Says:
    November 11th, 2008 at 5:31 pm

    The only problem I see with the first one is it’s probably not that hard for a bot to read. A bit of colour filtering would remove the background and random lines, and OCR from there would be easy. I can read it just fine.

  186. Les 10 pires Captcha d’Internet | Pixel Utile Says:
    November 12th, 2008 at 6:50 pm

    [...] Vu sur Jhon M Willis ESM Blog [...]

  187. Who's responsible for this pain - anyone know? Says:
    November 14th, 2008 at 6:18 am

    [...] Re: Who’s responsible for this pain – anyone know? This is a funny collection of Captchas I came across a while back. Some of them you think, that just CAN’T be real. But apparently, the mathematical equation IS actually a real Captcha! Must be for the Mensa website! Top 10 Worst Captchas | IT Management and Cloud Blog [...]

  188. CAPTCHA para electrónicos « De par en par Says:
    November 24th, 2008 at 4:48 am

    [...] Si es que en esto de los CAPTCHA hay de todo, aunque a veces es muy jodido acertar con lo que pone…. [...]

  189. November Roundup | IT Management and Cloud Blog Says:
    December 2nd, 2008 at 11:21 am

    [...] Top 10 Worst Captchas [...]

  190. Security Guardians Team » Blog Archive » Antispam pour les commentaires de blog : un Captcha sans images! Says:
    December 5th, 2008 at 8:51 am

    [...] (aussi appelés Captchas) visent à séparer les robots des êtres humains, allant de l’image plus ou moins lisible au questions les plus absconses (« quel est le troisième chiffre dans la chaîne 012345 (en [...]

  191. Bill Ryan’s Other Blog » 10 Worst Captchas Says:
    December 16th, 2008 at 10:16 pm

    [...] bad part is that I run into several of these on a regular basis.  So are they really that bad?  Need I say [...]

  192. My Top 10 Posts in 2008 | IT Management and Cloud Blog Says:
    December 25th, 2008 at 9:58 pm

    [...] Top 10 Worst Captchas [...]

  193. Daily Links | AndySowards.com :: Professional Web Design, Development, Programming, Hacks, Downloads, Math and being a Web 2.0 Hipster? Says:
    December 28th, 2008 at 8:02 pm

    [...] Top 10 Worst Captchas | IT Management and Cloud Blog LOL Nice list of the WORST Captchas (tags: design blogs culture authentication accessibility lol captcha humour 2008 technology webdesign web fun funny blog web2.0 ui list geek internet humor wordpress usability top10 bad spam Security ai captchas net) [...]

  194. Scurte si utile de azi 30.12.2008 | psaico's blog - EU insemnez. TU apreciezi. © Says:
    December 30th, 2008 at 5:34 am

    [...] prostii de captchas [...]

  195. So war das damals | Mensch oder Maschine? Says:
    December 31st, 2008 at 1:28 pm

    [...] sich durch völlige Abwesenheit von Usability auszeichnen. John M. Willis hat in seinem Blog jetzt die 10 schlechtesten CAPTCHAs zusammengetragen. Meine zwei Favoriten sind übrigens diese beiden [...]

  196. cheber Says:
    December 31st, 2008 at 3:42 pm

    Windows Live Mail have at the moment IMO unreadable capcha every time. I pressed about 60+ times before I got that was remotely readable. It was only luck that I managed to guess right.
    I tried the audo “capcha” ones but I couldn’t really hear the numbers.

    Capcha is my number 1 hate object on the net.

  197. Wisconsin Chit-Chat & Daily Check-in... - Page 118 - theBubbler Says:
    January 21st, 2009 at 11:11 am

    [...] Wisconsin Chit-Chat & Daily Check-in… How does everyone feel about captcha code? Does it drive you nuts trying to type it correctly or that sites use it at all. Half the time I [...]

  198. Captchas - 3-Bein - buntes Magazin» Satire Says:
    January 22nd, 2009 at 4:09 am

    [...] mehr schöne Beispiele findet man auf → dieser Seite hier, wo auch das obige Captcha-Bild herstammt. Kunden, die diesen Artikel lasen, interessierten sich [...]

  199. How a CAPTCHA can Kill Conversions | Ziller Web Marketing Blog Says:
    January 26th, 2009 at 7:24 am

    [...] I go I recommend you check out this post on badly designed CAPTCHAs, wouldn’t any of these send you insane? Be Fair & [...]

  200. Ihr seid so lächerlich… « 4Nubbels Says:
    January 27th, 2009 at 12:11 pm

    [...] http://www.johnmwillis.com/other/top-10-worst-captchas/ [...]

  201. Jason Says:
    January 31st, 2009 at 10:36 am

    Here’s an embarassingly poor captcha…how is that going to stop a computer?

  202. Jason Says:
    January 31st, 2009 at 10:37 am

    Here’s an embarassingly poor captcha…how is that going to stop a computer?
    http://www.gov.state.ak.us/govmail.php

  203. coffee Says:
    February 11th, 2009 at 6:14 pm

    some captchas make like more difficult, while others are too funny (in a robotic sort of way)

  204. Les 10 pires Captchas | Thibaut De Saint Florent Says:
    February 24th, 2009 at 4:50 am

    [...] Ajax. Toujours est-il que je viens de tomber sur un classement croissant des 10 captchas les pires rencontré par john willis et il y a vraiment [...]

  205. Patrick Says:
    February 27th, 2009 at 2:47 pm

    Ha! These are great. I wrote a blog post about captchas today (http://dpatrickcaldwell.blogspot.com/2009/02/completely-automated-public-turing-test.html) and used yours as a reference. I think it’s a little ironic that your comment box doesn’t have a captcha though, don’t you think?

    Patrick

  206. Patrick Says:
    February 27th, 2009 at 2:48 pm

    Ha! These are great. I wrote a blog post about captchas today (Ha! These are great. I wrote a blog post about captchas today (http://dpatrickcaldwell.blogspot.com/2009/02/completely-automated-public-turing-test.html) and used yours as a reference. I think it’s a little ironic that your comment box doesn’t have a captcha though, don’t you think?
    Patrick) and used yours as a reference. I think it’s a little ironic that your comment box doesn’t have a captcha though, don’t you think?
    Patrick

  207. Patrick Says:
    February 27th, 2009 at 2:50 pm

    Sorry, for the multiple posts . . . I figured the first two would get filtered because my formatting was messed up. Here’s what I was going for John:

    Ha! These are great. I wrote a blog post about captchas today (http://dpatrickcaldwell.blogspot.com/2009/02/completely-automated-public-turing-test.html) and used yours as a reference. I think it’s a little ironic that your comment box doesn’t have a captcha though, don’t you think?
    Patrick

  208. Cuando no puedes demostrar que no eres una máquina | Un hombre solo en la Red Says:
    March 25th, 2009 at 7:36 am

    [...] John M Willis ESM Blog) Tags: recopilacion de los peores captchas worst captchas compilation VN:F [1.1.7_509]please [...]

  209. » Blog Archive » 3 sem. Project:Security by Obscurity Says:
    April 1st, 2009 at 8:28 am

    [...] Here you can see some of the worlds worst captchas [...]

  210. Torley Says:
    April 4th, 2009 at 7:53 am

    While not as bad as some of the examples on the list, I just got a dreaded fraction! http://www.flickr.com/photos/torley/3410977613/sizes/o/

  211. Ataraxia! :: Os 10 piores CAPTCHAs do mundo Says:
    April 9th, 2009 at 11:02 pm

    [...] resolver, mesmo para seres humanos. Apenas pra descontrair um pouco, extraí os exemplos abaixo do blog do John Willis, e decidi compartilhar por achar interessantes. Escreverei em breve um artigo sobre a criação de [...]

  212. Matthew Says:
    April 22nd, 2009 at 10:12 pm

    It’s when CAPTCHA’s start to mock me, first subtly, almost imperceptibly. They’ve been ratcheting up their attack recently. I got one that read:
    Hey Jerk. It wasn’t like that in two neat sentences, but the point was taken.

  213. Sakthi Gs Says:
    May 7th, 2009 at 4:34 am

    How we recognize the character in the captcha

  214. 2115 Says:
    May 10th, 2009 at 7:26 pm

    The math problem is technically flawed. The function is a function of x only (pi is a constant). The problem asks you to evaluate the partial derivative of the function with respect to x at x=0. Instead of the partial derivative, the question should use the “normal” derivative.

  215. CAPTCHA Alternatives and Articles « The BAT Channel Says:
    May 27th, 2009 at 6:35 am

    [...] it’s poor in usability, and often times not accessible–even for any human user; see Top 10 Worst Captchas. Even so, it’s still way too common on the web. Damn spammers are forcing developers to [...]

  216. CAPTCHA Alternatives and Articles « AccessTech News Says:
    May 27th, 2009 at 6:37 am

    [...] it’s poor in usability, and often times not accessible–even for any human user; see Top 10 Worst Captchas. Even so, it’s still way too common on the web. Damn spammers are forcing developers to [...]

  217. What is so hard about making the conversation easy — Shooting at Bubbles Says:
    June 2nd, 2009 at 12:06 am

    [...] Eric says in his post Congradulations ZDNet, you have a captcha worse than Typepad (and that’s saying a lot). No wonder the conversation is leaving the [...]

  218. Fresh From Twitter | so how did we get here? Says:
    June 3rd, 2009 at 5:19 am

    [...] here’s the top 10 worst captchas http://bit.ly/VxKuk via @markdsieversreCAPTCHA is a most excellent endeavour because as well as proving your humanity, [...]

  219. Fresh From Twitter | so how did we get here? Says:
    June 3rd, 2009 at 10:21 pm

    [...] to spam http://bit.ly/13H0Yn new blog postalternatively here’s the top 10 worst captchas http://bit.ly/VxKuk via @markdsieversreCAPTCHA is a most excellent endeavour because as well as proving your humanity, [...]

  220. Fresh From Twitter | so how did we get here? Says:
    June 10th, 2009 at 3:37 am

    [...] to spam http://bit.ly/13H0Yn new blog postalternatively here’s the top 10 worst captchas http://bit.ly/VxKuk via @markdsievers Powered by Fresh From Written by Bob Hitching in: Twitter | Tags: fresh, [...]

  221. DoN Says:
    June 20th, 2009 at 10:08 am

    Some of them are awesomely crazy !

  222. bugstomper Says:
    June 20th, 2009 at 5:06 pm

    2115 (comment #214), If you can’t figure out the answer because they used a partial derivative symbol where you think it should be a regular derivative, then you have failed to demonstrate the human flexibility in thinking that they are testing for. Perhaps that “error” is on purpose to fool some calculus-enabled robots.

  223. Le Blog de Jef » Captcha sans captcha avec une temporisation Says:
    June 30th, 2009 at 5:56 am

    [...] trouve cette idée pas mal car je déteste les captchas mais nous savons tous que c’est un mal nécessaire . Ce captcha attends juste que vous ayez [...]

  224. CAPTCHA Alternatives and Articles | The Free Site | Hosting | Others Says:
    July 8th, 2009 at 4:43 am

    [...] it’s poor in usability, and often times not accessible–even for any human user; see Top 10 Worst Captchas. Even so, it’s still way too common on the web. Damn spammers are forcing developers to [...]

  225. Los CAPTCHA más raros de la web | Enchufa2 Says:
    July 31st, 2009 at 1:13 pm

    [...] Top 10 Worst Captchas [...]

  226. puppy Says:
    August 16th, 2009 at 11:55 am

    how 2 solve calcu sum of relative maximum and minimum

  227. puppy Says:
    August 16th, 2009 at 11:56 am

    how 2 solve calcus sum of relative maximum and minimum

  228. Opium für’s Volk « Na logo, letscho! Says:
    September 3rd, 2009 at 1:04 pm

    [...] 8. Top Ten worst Captchas! [...]

  229. How to stop spam without captcha or javascript | var/log Says:
    September 12th, 2009 at 8:34 am

    [...] those nasty spam-bots while at the same time blissfully destroying the usability of the web (10 “good” examples). While a lot of attempts have been made to make it more usable for more people (pictures [...]

  230. webanalyser-Blog » Blog Archive » Kurz verlinkt: Top 10 worst captchas Says:
    September 17th, 2009 at 10:44 am

    [...] einfach nur eingeblendet wird, um einen zu ärgern. Bei Johnmwillis.com gibt es die Top 10 worst captchas, die wirklich richtig schlimmen Captchas, die niemand in seine Seite einbauen [...]

  231. Google compra reCAPTCHA e pretende digitalizar livros públicos • Winnext Says:
    September 18th, 2009 at 4:44 pm

    [...] diferenciar quem é humano e quem é máquina, já que nós podemos descrever o que está escrito (não todas as vezes), porém robôs e computadores demoram um tempão para descobrir o que é que está na imagem, [...]

  232. George Garchagudashvili Says:
    September 23rd, 2009 at 4:49 am

    :d

  233. ArmyWife Says:
    November 9th, 2009 at 7:24 am

    I don’t know why they waste their time doing this captcha thing. It’s a pain in the butt and besides there are companies (I used 2 of them) that have systems to by pass those for like BP, CL & Kijiji…AND! people use them when they don’t even need them on their sites.
    Just my 2 cents

  234. dizelbox Says:
    November 22nd, 2009 at 11:35 am

    It is realy bad.

  235. How to avoid spam? | paul olyslager Says:
    November 24th, 2009 at 3:13 am

    [...] the fancy ajax plugin where you need to drag and drop a certain icon to prove you’re human. John Willis made a summary of 10 examples on how not to integrate [...]

  236. Spam (not the food) & Upcoming Posts Says:
    November 27th, 2009 at 10:12 pm

    [...] Wow, for the last few days I’ve been getting over 200 spam comments a day! Finally installed a captcha plugin so you’ll have to enter four simple letters before submitting your comment. Don’t worry, it won’t be anything like these TOp 10 Worst Captchas [...]

  237. avanzaweb Says:
    November 28th, 2009 at 4:10 pm

    I like answer math challenges…I prefer the fith one.

  238. Online Drawing Says:
    December 5th, 2009 at 7:55 am

    holy crap lol :D wow man and how XD im thinking of hte expressions of people who had to fill these captchas out hehe

  239. Some Guy Says:
    December 5th, 2009 at 5:12 pm

    Then look closely, x=0.
    Its hardly maths after that.

  240. Google Bullshit Captcha (pronounced ˈkæptʃə’) | SEO Bullshit Says:
    May 10th, 2010 at 3:14 am

    [...] after I started this post, I found the a similar post of all Bullshit Captchas lists.  While that list is now a bit dated, it’s still pretty good.  In that post, there are some [...]

  241. Pip Wilson Says:
    May 25th, 2010 at 1:47 pm

    Facebook overdoes captchas, badly. The one I got tonight on FB was ‘people wreckage’.

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