This is a story about a man. His wife has told him that if he ever comes home drunk she will leave him.
Nonetheless he goes out. He drinks a lot and throws up all over himself. He turns to his friend and asks what he can do. His friend is helpful.
“Go home,” he says. “Tell your wife someone threw up on you. And put a twenty pound note inside your jacket pocket. Show her the money and tell her the other man gave it to you for the dry cleaning bill.”
So this he does. His wife is at first angry. But he explains. He tells her about the drunk man who threw up on him. He shows her the twenty pounds.
She looks. “But why have you got two £20 notes?” she asks.
“Oh,” he says. “The other one is from the man who shat in my pants.”