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I once implemented a "poor man's captcha" that presented a simple randomized question that anyone would be able to answer (ranging from "what year is it" to "what's 2 + 2"). I guessed that nobody would make the effort to write a custom script for this, because the website in question was so niche and the stakes so low -- a very quiet corner of the Internet; I don't even remember what is was, possibly some feedback form that went to a support email. I actually felt some irrational measure of pride when, probably a year later, I was looking at some logs and discovered that some script kid had cracked the questionnaire and was currently using the form to post nonsense text with Viagra links. Someone had actually sat down and written code to crack my terrible solution, and probably spent more time on it than I had (which is to say, more than five minutes). Made my day.



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