The drunk leaves the bar. Ten minutes later the drunk comes back in through the back door. The bartender tells him, "I told you to go home, I'm not serving you anything more, you've had enough, now go home."

The drunk leaves again.

Ten minutes later the drunk comes back in through a side door. Again, the bartender tells him, "Man, I told you, you're wasted. I'm not serving you anymore, now go home, you've had enough."

Again, the drunk leaves.

Fifteen minutes later the drunk comes back through another side door. The bartender says, "What the hell is the matter with you? I keep telling you, you've had enough already, and I'm not going to serve you anymore, now go home!"

The drunk looks up at the bartender and asks, "How many places do you work at?"