A man goes to the supermarket and notices an attractive woman waving at him. 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?”
“I think you’re the father of one of my kids,” she says.
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 made love to?”
“No, I’m your son’s teacher,” she says.