Harry is at a banquet and keeps complaining that his false teeth are hurting him. The guy sitting to his left reaches into his pocket and pulls out a set of dentures. He hands them to Harry and says, Try these.

Harry tries them, and says, Thanks anyway, but theyre too tight. The guy pulls out another set and hands them to Harry. They fit perfectly, so Harry wears them for the entire night. At the end of the banquet, Harry hands them back to the guy and says, They fit me perfectly. Are you a dentist?

The guy says, No, Im an undertaker.