Don't I know  you?

A guy is in line at the Super Market when he notices
that the  rather dishy blonde behind him has just
raised her hand and smiled hello to  him.

He is rather taken aback that such a looker would be
waving to  him, and although familiar he can't place
where he might know her from, so he  says "sorry, do
you know me?"

She replies "I may be mistaken, but I  thought you
might be the father of one of my children!"

His mind  shoots back to the one and only time he has
been  unfaithful....

"Christ!" he says "are you that stripogram at  my
bachelor party that I had on the pool table in front
of all my buddies  while your friend whipped me with
some wet celery and stuck a cucumber up my  ass?"

No" she replies, "I'm your son's English  Teacher."