One night, a drunk came stumbling into a bar and said to the bartender, “Drinks for all on me, including you, bartender.”
So the bartender poured everyone and himself a round, but then the drunk admitted that he had no money. Incensed by the revelation, the bartender roughed up the drunk and threw him out.
The next night the same drunk came in again and ordered drinks for everyone in the bar including the bartender. Again the bartender poured the drinks, and again the drunk said he didn’t have the money. So the bartender roughed him up worse than before and threw him out.
On the third night the drunk came back and order drinks for everyone except the bartender.
“What, no drink for me?” replied the bartender.
“Absolutely not!” said the drunk. “You get violent when you drink.”