Inflation
One night, a 5-year old heard noises coming from his parents’ bedroom, so the curious boy went to have a look.
Next morning he asked his mother, “Mommy, why were you jumping up and down on Daddy’s tummy last night?”
“Oh, I like to jump on Daddy’s tummy so it doesn’t get too big, and Daddy really likes it when I jump on him. He says it keeps him in shape.”
“I don’t think it’s working.”
“No? Why not?”
“‘Cause the babysitter keeps blowing him back up.”