Haven't done one in a while!
A guy goes to the supermarket and notices a beautiful blonde woman wave at him and say hello.
He's rather taken aback, because he can't place where he knows her from.
He asks, "Do you know me?" and 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 he says, "My God, are you the stripper from my bachelor party
that I made love to 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."