I have never actually come close to finding the answer to that question. Everytime I see a comically anthropomorphized banana holding his peel in a suggestive manner, likening the peel to clothes and his peel-less nature to human nudity, I bust up laughing. This happens every time, no matter where I am, be it the house or the bus or in class. Sometimes I laugh just thinking about it.
So why do we laugh?