“I bet you $10 you’ve got a mole on your b*tt.”
The teacher thinks that she will break his little gambling problem, so she takes him up on the bet.
She pulls her pants down, shows him her b*tt, and there is no mole.
That afternoon, Johnny goes home and tells his dad that he lost $10 to the teacher and explains why.
His dad calls the teacher and says,
“Johnny said that he bet you that you had a mole on your b*tt and he lost.”
The teacher says,
“Yeah, and I think I broke his gambling problem.”
Johnny’s dad laughs and says,
“No you didn’t, he bet me $100 this morning that he’d see your a$s before the day was over.”