Little Johnny's preschool class went on a field trip to the fire station. The fireman giving the presentation held up a smoke detector and asked: "Does anyone know what this is?"
Little Johnny's hand shot up and he said: "That's how Mommy knows supper is ready!"
A guy is at the funeral home viewing his wife's coffin with a sad look on his face. His friend walks up to comfort him and says: "Don't worry Harry, you'll meet another woman."
"I know," Harry replied, "but what am I going to do tonight?"