When little Johnny was eight his Dad was taking him to see a movie. On the way there he asked him if he would buy me some gum. He said, "No, you don't need any."
After arriving at the theater and taking their seats, Dad changed his mind. He told little Johnny it would be okay for him to have some gum and he was going to get it.
Little Johnny spoke up and said, "You don't need to buy me gum anymore, Daddy. I found some under the seat."