Craziest captchas on the web

Les Captchas les plus fous du web : Just mathWe find more and more of these graphic checks that are supposed to protect a web site against the programmed automatons. the idea is to ask a question that (intelligent) human beings can answer and a (silly) automaton will not. But sometimes, the author of the web site goes a little too far and you wonder who on Earth would be able to answer correctly the question.

Some examples of Captchas gone mad.