Little Johnny's preschool class went on a field trip to the fire station. The firefighter giving the presentation held up a smoke detector and asked the class: "Does anyone know what this is?"
Little Johnny's hand shot up and the firefighter called on him.
Little Johnny replied: "That's how Mommy knows supper is ready!"
Little Johnny's kindergarten class was on a field trip to their local police station where they saw pictures, tacked to a bulletin board, of the 10 most wanted criminals.
One of the youngsters pointed to a picture and asked if it really was the photo of a wanted person. "Yes," said the policeman. "The detectives want very badly to capture him".
Little Johnny asked, "Why didn't you keep him when you took his picture?"