Was living in NC and heard this one - feel free to fill in other schools
2 guys in the restroom at a Duke / UNC basketball game.
The Duke guys says to the other, who is washing his hands, "you must have gone to UNC"
"Yes" he says, "how can you tell?"
The Duke guy replies. "I understand they teach you to wash yours hands after using the toilet".
"Of course" the UNC guys says......
The Duke guy replies as he walks out without washing his hands "at Duke, they teach us not to pee on our hands"