Little Johnny walks in to his parent's bedroom and sees his dad giving his mum one.

His dad just laughs, throws a pillow at him and shouts: "Get out!"

A little while later Johnny's dad hears a commotion coming from Johnny's room, so he rushes in and is horrified to see Johnny shagging his gran.

Johnny just looks at him and says: "Not so f*ckin funny when it's your mum, is it?"

Marco.