A guy goes into the supermarket and notices a beautiful blond woman wave at
him and she says hello. He's rather taken back, because he can't place
where he knows her from. So 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 and 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 butt with wet celery ???"

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