Hahaha!!
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?'
She replies, 'I think you're the father of one of my kids.'
His mind travels back to the only time he has ever been unfaithful to his wife and says,
'Are you the stripper from the stag party I made love to on the pool table with 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.”