Busted
 

A college student staggers out of a pub and stumbles down the street, where a passing cop grabs him.
"Excuse me, buddy. Where do you think you're going in that state?" asked the bemused cop.
"I'm going to a lecture," replies the drunk.
"Yeah, right," says the policeman. "What do you take me for? No one gives a lecture this time of night!"
"You obviously haven't met my girlfriend," says the kid.

Classic