Anyway, there was this party to celebrate the end of high school. Lots of booze. Lots of chicks. No parents.
Now this person — a young women — was pretty low on the self-esteem and pretty high on the booze. And without condoning anything, she was on the floor having the living daylights thrust out of her by an almost equally inebriated male. As a joke — and it was a really funny one — he put a paper bag over her head, and called out to the applauding onlookers that “This slut’s a real ugly bitch.”
Then when he’d finished, two more males had a go, and then a fourth.
And when the fourth one finished he took the bag off her head and it was his sister.