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A little boy wakes up 3 nights in a row when he hears a thumping sound coming from his parents bedroom.
Finally one morning he goes to his mom and says, "Mommy , every night I hear you and daddy making noise and when I look in you're bouncing up and down on him".
His mom is taken by suprise and says "Oh... well I'm bouncing on his stomach because he's fat and that makes him thin again."
The little boy says, That won't work"
His Mom says, "WHY?"
The little boy replies "Because the lady next door comes over, after you leave, and blows him back up!!"