A guy goes to the supermarket and notices a beautiful blonde wave at him and say hello.
He’s rather taken aback, because he can’t place where he knows her from. So he says, "Do you know me?"
She replies, "I think you’re the father of one of my kids."
The guy's mind travels back to the only time he has ever been unfaithful to his wife and says, "My God, are you the dancer from my bachelor party, oh my god, I know I was drunk that night, but you got pregnant! Please don’t tell my wife, she’ll kill me!"
She looks into his eyes and calmly says, "No, actually I’m your son’s math teacher."
