Roy 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 Roy that it appears that 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?

Roy is briefly surprised, then softly scoffs, grumbles, climbs
down off the bar stool and staggers out the front door.

A few minutes later, Roy 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 service to him due to his inebriation, and again
offers to call a cab. He 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, Roy bursts in through the BACK door of
the bar. He plops himself up on a bar stool, gathers his wits
and belligerently orders a drink. The bartender comes over and
emphatically reminds him that he is clearly drunk, will be
served no drinks, and either a cab or the police will be
called immediately.

Roy surprisingly looks at the bartender, and in hopeless
anguish, cries -
"MAAAN! How many bars do you work at!?!?!"