A guy goes to the supermarket.
As he is standing at the meat counter he notices a beautiful blond woman waving at him.
She says "Hello."
He's rather taken back, because he can't place where he knows her from.
He says, "Do you know me?"
To which she replies,"
I think you are the father of one of my kids."

Now his mind travels back to the only time he has ever been unfaithful to his wife.

He says " My god, are you the stripper from my bachelor party that I laid on the pool table with all my buddies watching, while your partner whipped my bare butt with wet celery and then stuck a carrot up my ass?"

She looks into his eyes and calmly says "No, I'm your son's math teacher."