A little boy walks into his parents room and sees his mom on top of his dad bouncing up and down.
The mom sees her son and quickly dismounts, worried about what her son has just seen.
She dresses quickly and goes to find him.
The little boy sees his mom and asks, "What were you and dad doing?"
The mom replies, "Well, you know your dad has a BIG tummy, so sometimes I have to get on top of it to help flatten it."
"You're wasting your time," said the little boy.
"Why is that?" asked his mom-- puzzled by his comment.
"Well," he started, "when you go shopping, the lady next door comes over, gets on her knees, and blows it right back up!"
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