The Yale fellow finishes and goes to the sink to wash his hands. A few moments later to Harvard man gives himself a good shake, zips up and starts walking out the door.
“Hey” the Yale man says. “At Yale we wash our hands after we go to the bathroom.”
The Harvard man doesn't miss a beat. “At Harvard we don't p!ss on out hands” he says over his shoulder as he scoots out the door.
That’s a good one! (I went to CU Boulder, so we were lucky just to hit the urinal.)