The Cornell guy considers a moment and replies, "At Cornell they teach us not to piss on our hands."
You may substitute school names as you like.
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Apropos of nothing, I witnessed a fellow in the "Ten Items or Less" line in a market in Cambridge, MA. He had like 25 items. The checker said to him, "Are you from M.I.T. and can't read or Harvard and can't count?"
--Boris