Little Johnny was walking home one day when he saw his dad and his aaunt drive into a clearing and make out. He ran home and started to tell his mum but she said, "Let's save this story for when we have dinner with daddy."
So while they had dinner, Little Johnny told his story and dinished off saying, "and then I saw Daddy and Aunt Sally doing what Mummy and Uncle Jim used to do when Daddy was in the army!"