I think you're the father of one of my kids...

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,
'Are you the stripper I made love to on the pool table

at that Bachelor party with all my buddies watching

while your partner whipped my butt with wet celery?'

She looks into his eyes and says calmly,

'No, I'm your son's teacher.'