A little boy walks into his parents' room and saw 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 seen.

She dresses quickly and goes to find him. The Son sees the Mom and asks, "What were You and Dad doing?"

The Mom replies, "Well, You know your Dad has a big tummy and sometimes I have to get on top of it to help flatten it."

"Your wasting your time." replied the boy.

"Why is that?" asked the Mom. puzzled.

"Well, when You go shopping the lady next door comes over and gets on her knees and blows it right back up."

Gotta love those short but punchy ones and this one packed a lot of punch