Little Johnny is taking a walk…

Little Johnny is taking a walk in the woods and he walks by a lake. He looked in the water and saw a naked girl swimming.
She called to him to come on in. He ran away from there as fast as he could.
Later Little Johnny returned and the girl asked him why he had run away. He replied, “Mom told me that if I look at a naked girl, I will turn into stone. My dick had already become as hard as a rock!!