Ed: you're not allowed to leave to pee in the middle of the exam.
Professor: (shocked voice) Ed!
Ed: (abashed) Well, unless you have to. But then you will have to go with a guard so you don't cheat.
Professor: There's nothing new under the sun.
Ed: Except Teletubbies.
Teletubbies scare me, but I just found this in some old notes, and I thought it might make some people laugh.