Little Johnny is bored one day so he goes wandering around the house.
First he wanders into his parents' room, and finds his mam and dad having sex.
- What are you doing, Dad?
- Me and your mam are just playing a card game!
Next he walks into his older sister's room, and finds her having sex with her boyfriend.
- What are you doing, big sis?
- Me and my boyfriend here are just playing cards!
Next he wanders into his older brother's room, to find his brother having sex with his girlfriend.
- What are you up to, Big Johnny?
- I'm just having a quick game of cards with my missus!
Finally he enters the bathroom, where his uncle is busy having a wank.
- I suppose you're playing cards, as well, like all the others?
- That's right, son, yes, I'm playing cards.
- Don't you need a partner?
- Look, son, when you've got a hand as good as this, you don't need a partner!