one lost night

A guy goes to a supermarket and notices a beautiful blonde wave at him and saying a sweet "hello!"

He's rather taken aback, because he can't place where he knows her from. Finally he says, "Um, do you know me?" She replies, "I think you're the father of one of my children."

Uh oh....

He thinks back to the only time he has ever been unfaithful and has a sudden recollection of a drunken party.

"My god," he says. "Are you the stripper from my bachelor party that I coaxed into a private room with a $50 bill, and then we had sex on the pool table with all my buddies watching from the door while I yelled 'I call the corner pocket!' while you screamed 'Harder, harder!' and 'Deeper, deeper!'?"

She hardly missed a beat when she said "Well, no. I'm your son's math teacher."