"The Rocking Horse" joke

A mother, visiting a department store, took her son to the toy department. Spying a gigantic rocking horse the boy climbed
up on it and rocked back and forth for almost an hour.

"Come on, Son," the mother pleaded. "I have to get home to get father's dinner."

The little lad refused to budge, and all her efforts were unavailing. The department manager also tried to coax the little fellow without meeting with any success. Eventually, in desperation they called the store's psychiatrist. Gently he walked over and whispered a few words in the boy's ear, and immediately the lad jumped off and ran to his mother's side.

"How did you do it?" the mother asked incredibly. "What did you say to him?"

The psychiatrist hesitated for a moment, then said, "All I said was, `If you don't jump off that rocking horse at once, son,
I'll knock the stuffing out of you!'"