Borrowed False Teeth

A man coughed violently, and his false teeth shot across the room and smashed against the wall. "Oh, dear," he said, "whatever shall I do? I can't afford a new set."
"Don't worry," said his friend. "I'll get a pair from my brother for you."
The next day the friend came back with the teeth, which fitted perfectly.
"This is wonderful," said the man. "Your brother must be a very good dentist."
"Oh, he's not a dentist," replied the friend, "he's an undertaker."