A man walks into the front door of a bar, he is obviously drunk, and staggers up to the bar, seats himself on a stool, and with a belch, asks the bartender for a drink.

The bartender politely informs the man that it appears he has already had plenty to drink, he could not be served additional liquor at this bar, and could a cab be called for him?

The drunk is briefly surprised, then softly scoffs, grumbles, climbs down off of the stool and staggers out the front door.

A few minutes later, the same drunk stumbles in the SIDE door of the same bar.
He wobbles up to the bar and hollers for a drink.

The bartender comes over and, still politely-but more firmly, refuses to serve the man due to his inebriation, and again offers to call a cab.

The drunk looks at the bartender for a moment angrily, curses, and shows himself out the side door, all the while grumbling and shaking his head.

A few minutes later, the same drunk bursts in through the BACK door of the bar.

He plops himself down on a bar stool, gathers his wits and belligerently orders a drink.

The bartender comes over and emphatically reminds the man that he is clearly drunk, will not be served a drink, and either a cab or the police will be called immediately.

The surprised drunk looks at the bartender, and in hopeless anguish, cries, “MAAAN! How many bars do you work at?”