Another funny one (also by a familiar name, though perhaps not as much in contest math circles) is Manjul Bhargava's: http://www.math.princeton.edu/graduate/generals/bhargava_man...

In this case, the funniness is for the totally opposite reason: sounds like Bhargava totally crushed his exam.

Also, is anyone surprised how well everybody seems to remember the details of their exams?! I suspect I'd barely remember anything afterwards...