One day, Little Johnny needs to use the bathroom. His mom is in there, so he went in to use it and asked his mom, "What is that between your legs?"
His mom told him that is her bush. Then the next day the same thing happened, but with his dad. He asked his dad, "What is that between his legs?" He said, "My snake."
The same thing happened one more time, except with his grandmother. Little Johnny asked grandma what is on her chest. She said, "My headlights."
One night, Little Johnny caught his parents doing something naughty. Then he said, "Grandma, grandma, turn on your headlights! Daddy's snake is trying to get into mommy's bush!"