Oops

A man is in a queue at Waitrose and sees this busty blonde staring at him, he can't believe she is staring at him, then she starts waving.

'Excuse me do I know you?'

'Yes I think you are the father of one of my kids' she replies.

The man thinks back and recalls a particular memorable act from his past.

'Are you one of the three birds I diddled on my stag night? I remember one of your mates was whipping me after the other one had stuck a paintbrush up my bum?'

'No!

Spoiler:

I'm your son's Geography teacher!'