Professor
A Texan got accepted to Harvard
A week before classes started, he decided to tour the campus to see where everything was. After a while he got lost, so he went up to a professor and asked "Do you know where the library's at?"
The professor replies, "Sorry, here at Harvard we don't end our sentences with prepositions."
After a few seconds of thinking, the Texan asks, "Where's the library at, asshole?"