So a Harvard man and a Yale man are at the urinal. They finish and zip up. The Harvard man proceeds to the sink, while the Yale man immediately makes for the exit. 

The Harvard man says, “At Harvard they teach us to wash our hands after we urinate.”

The Yale man replies, “At Yale they teach us not to piss on our hands.” 

I don’t remember where I heard this joke, but I always thought it would be improved if there were a third man in the bathroom. He overhears the exchange, looks at the other two, and says:

“Huh. I went to a state school, but as I recall most of us learned all that stuff before we even got to college.”

(Source: studentactivism.net)