Vincent walks into a bar in Pretoria, orders three pints of Black Label and sits in the back of the room, drinking a sip out of each one in turn.
When he finished all three, he comes back to the bar and orders three more.
The bartender says to him, "You know, a pint goes flat after I draw it; it would taste better if you bought one at a time." Vinn replies, "Well, you see, I have two friends. One is in Polokwane, the other in Lebowakgomo, and I'm here in Pretoria. When I left home, we promised that we'd drink this way to remember the days we all drank together."
The bartender admits that this is a nice custom, and leaves it there.
Vinn becomes a regular in the bar and always drinks the same way: he orders three pints and drinks the three pints by taking drinks from each of them in turn.
One day, he comes in and orders two pints. All the other regulars in the bar notice and fall silent.
When he comes back to the bar for the second round, the bartender says, "I don't want to intrude on your grief, but I wanted to offer my condolences on your great loss."
Vinny looks confused for a moment, then a lights dawn in his eye and he laughs. "Oh, no," he says, "Everyone is fine. It's me…"
"…I've quit drinking!"