Room Air Conditioner

A customer is continually bothering a waiter in a restaurant. First he asks for the air conditioning be turned up because he was too hot, then he asks for it be turned down because its too cold, and so on for about half an hour. Surprisingly, the waiter is very patient, walking back and forth and never getting angry. So finally, a second customer asks, “Hey, why don't you just throw out that pest?” "Oh, I don't mind," says the waiter with a smile. "We don't even have an air conditioner."