A six-year-old walks into the kitchen where his mom is preparing a meal and says:

"Mom, the last few nights I have woke up to this thumping noise coming out of your bedroom and when I looked to see what it is, you're sitting on top of dad and bouncing up and down. Why are you doing that?"

The startled mother recovers quickly and says,

"Your dad is a little overweight and I'm trying to get him back to normal size. I bounce on him to get all the air out of him."

The little kid just shakes his head and says,

"Mom, you're wasting your time, because, once a week, that nice- looking lady next door comes over and blows daddy right back up!"