A little boy wakes up three nights
in a row when he hears a thumping
sound coming from his parents
room.

Finally one morning he goes to his
mom 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 mom is taken by surprise and
says, "Oh.. Well.. ah.. 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 mom says, "Why?"

And the boy replies, "Because the lady next door comes by after you
leave each day and blows him back
up."