A man phones a mental hospital and asks the receptionist...
A man phones a mental hospital and asks the receptionist if there is anybody in room 27. She goes and checks, and comesback to the phone, telling him No, the room is empty. "Good," says the man. "That means I must have really escaped."

A man went to the police station wishing to speak...
A man went to the police station wishing to speak with the burglar who had broken into his house the night before. "You'll get your chance in court," said the desk sergeant. "No, no, no!" said the man. "I want to know how he got into the house without waking my wife. I've been trying to do that for years!"