Little Jonny heard a noise coming from Mum and Dads room, and went to investigate. He pushed the door open and saw Dad doing Mum. Dad saw little Jonny standing there, and with a wink and a smile, he threw a pillow at him, and said 'Go to bed' A couple of days later Dad heard a noise coming from little Jonny's room, and went to investigate. He pushed the door open and saw little Jonny doing Gran. Jonny saw Dad standing there gob-smacked, and said... 'Not so F**king funny when it's your mum is it.'