Ha ha very good... the advanced maths question at number 6 is the best.
I, too, am surprised Rapidshare's captcha isn't there – not only does it stop spammers from entering the site but also everybody else too.
I think that possibly the only captcha that hasn't been broken yet is reCaptcha – I use it all the time unless it is on a site where accessibility is a must, in which case I would use a maths captcha and think of other ways of working around the spam problem.
Even the Google Gmail captcha has been broken which is why gmail addresses are the main choice for spammers the world over
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