A guy goes to the supermarket and notices an attractive woman
waving at him. She says hello. He's rather taken aback because he
can't place where he knows her from.

So he says, 'Do you know me?' To which 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 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 says calmly,
NO, am your son's teacher.