Little Johnny's Gambling Problem

"I want you to help me stop my son gambling," an anxious father said to his boy's principal.

"Leave it to me," said the principal.

A week later he telephoned the boy's father. "I think I've cured him," he said.

"How?"

"Well, I saw him looking at my beard and he said, 'I bet that's a false beard.'

'How much?' I said, and he said "$5 "

"What happened?" asked the father.

"Well, he tugged my beard, which is quite natural, and I made him give me $5. I'm sure that'll teach him a lesson."

"No, it won't," said the father. "He bet me $10 this morning that he'd pull your beard with your permission by the end of the week!"