Ever have an awkward moment with a total stranger?

A man goes to the supermarket and notices a beautiful blond woman waving at him and saying "Hello". He's rather taken aback because he can't place where he knows her from. So he says, "Do you know me?", to which she replies, "I think you're 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 of my buddies watching while your partner whipped my butt with wet celery?". She looks into his eyes calmly and says,

"No, I'm your son's math teacher".