An old joke has two brothers coming home from college and teasing each other about their respective choices of university.

Guy comes out of the bathroom without washing his hands, and his brother notices.

"At Yale," his brother says, "they taught us to wash our hands after taking a piss."

"At Harvard," comes the reply which you are no doubt already saying to yourself because you've heard it a hundred times, "they taught us not to piss on our hands."