In the 10th grade, my teacher was going on and on telling the class why she thought Christopher Columbus was so smart; I was not very interested in this. So when the teacher ask "Any questions?" I replied without thinking "If he's so smart how come he's dead?" which is a early Simpsons reference.
I was only out of the class for 15 minutes because she, admittedly, was going a little overboard on Christopher Columbus, which in its self was a nice pun.