Little Johnny wakes up three nights in a row to the sound of
thumping coming from his parents' bedroom.

Finally, on the third morning he says to his mother, "Mommy,
every night I hear you and Daddy making noise, and when I
look into your bedroom you're bouncing up and down on him".

Needless to say, Little Johnny's mother is taken by surprise,
so she quickly explains, "Oh... that's because your Daddy has
gained weight and I'm bouncing on his stomach to make him
thin again."

Little Johnny looks a tad confused and remarks, "Mommy, I
don't think that's gonna work."

"Why not, dear?"

"Because the lady next door comes by after you leave the
house every day and blows him right back up!"
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