I hope nobody takes offence..... Little boy walks in on his Mum and Dad having sex, so Dad slams the door on him and starts laughing. 30 minutes later a commotion erupts from the boys bedroom. His mum and dad burst in and see the son trying to have sex with his Granma. "Wot are th f...k are you doing" shouts his Dad "you dirty little bas,,,d". Little boy looks up and says "Not so funny when it's YOUR mum is it"