Came across this yesterday…
The late Sidney Morgenbesser was a Philosophy professor at Columbia, and something of a prankster.
I was looking him up yesterday, when I chanced upon this little gem:
During a lecture the Oxford linguistic philosopher J. L. Austin made the claim that although a double negative in English implies a positive meaning, there is no language in which a double positive implies a negative. To which Morgenbesser responded in a dismissive tone, "Yeah, right."
Check out the link to read more of his adventures. I particularly liked the one where he gets arrested. Had the cop been a philosophy major, he might have really been in trouble - I have seen the rage that Kant induces in some of my friends!