Paddy walks into a pub and orders 4 pints of beer. He explains to the barman that he used to have a drink together with his three brothers, but now they have all gone their separate ways. To keep up the tradition, however, they would still order drinks for each other. This becomes a regular practice and the barman gets used to Paddy ordering 4 pints every time.
One day, Paddy comes in and orders only 3 pints.
“I’m very sorry to hear,” says the barman.
“What do you mean?” asks Paddy.
“I thought maybe one of your brothers had passed away, since you only ordered 3 pints,” explains the barman.
“Oh no!” says Paddy, “everyone is fine! I’ve given up drinking…”