"A little child shall lead them" joke

Little Willie had a gambling problem. He'd bet on anything.
One day, Willie's father consulted his teacher.
The teacher said. "Mr.Gaines, I think I know how to teach Willie
a real lesson. We'll trap him into a big wager that he'll lose."
Willie's father agreed to cooperate with the plan.
The next day at school, the teacher watched Willie making wagers
with the other children, and she said, "Willie, I want you
to remain after class." When the others had left the
classroom, Willie walked up to the teacher. Before she could
say a word, he said, "Dont say it, Miss B; I know what you're
going to say, but you're a liar!"
"Willie!" the startled teacher said, "What are you talking about?"
"You're a fake!" Willie continued."How can I believe anything
you tell me? You've got this blond hair on top, but I've seen
your bush and it's pitch black!"
Trying to keep her cool, the teacher said, "Willie that isn't
true."
"I'll bet a dollar it is!" Willie challenged.
The teacher saw her chance to teach Willie his lesson. "Make
it five dollars and you have a bet," she said.
"You're on!" Willie whipped out a five dollar bill. Before anyone
could come into the room, Miss B. dropped her panties, spread her
legs, and showed Willie that her pubic hair was as blond as the
hair on top of her head.
Willie hung his head. "You win," he said, handing her the fiver.
Miss. B couldn't wait for him to leave so she could get to a phone to
call his father. She reported what had happened. "Mr. Gaines,"
she said, "I think we've finally taught him his lesson."
"The hell we have," the father muttered. "This morning Willie bet
me ten dollars that he'd see your pussy before the day was over."