A little boy walks into his parents bedroom, to see his mom on top of his dad bouncing up and down. The parents stop, and his mom quickly dismounts pulling the covers around her. "What were you and Dad doing?" Asked the little boy. "Well your dad has a big tummy and I have to get on top of it and flatten it sometimes." She explained. "Your wasting your time." Says the little boy. "When you go shopping the lady next door, gets on her knees and blows it right back up."