A man walk into a supermarket and notices a beautiful woman staring at him.
She stares for quite some time, so finally the man asked "Do I know you?"
The woman answers "I think your the father of one of my kids".
The man thinks for a minute then realizes this kid she is talking about must be the result of the one and only time he ever cheated on his wife.
So he says to the woman "are you the stripper that was at my best friends bachelor party about 5 years ago?" "You know, the one I had sex with on the pool table while your friend spanked my bare ass with a whip?"
The woman looks at him horrified and says "No, I'm your son's teacher".