This little boy wakes up 3 nights in a row when he hears a thumping sound
coming from his parents room. Finally one morning he goes to his mum and says,
"Mommy, every night I hear you and daddy making noises and when I look in your
bedroom you're bouncing up and down on him."
His mum is taken by surprise and says, "Oh, well I'm bouncing on his stomach
because he's fat and that makes him thin again."
And the boy says, "Well, that won't work!"
His mum says, "Why?!?"
And the boy replies, "Because the lady next door comes by after you leave
each day and blows him back up!"