A guy went to the supermarket and noticed an attractive woman waving at him. He was rather taken back because he couldn't place where he knew her from. So he said, "Do you know me?" To which she replied, "I think you're the father of one of my kids." Now his mind travelled back to the only time he had ever been unfaithful to his wife and said, "My God, are you the stripper from my bachelor party that I screwed on the pool table with all my buddies cheering while your partner was slapping my ass with a whip?!" She looks into his eyes and says calmly, "No, I'm your son's teacher."