He picks the guy up, beats the living daylights out of him, then throws him out into the street.
The next day the same drunk walks back into the same bar and says [with a drunken slur],
“Bartender, buy everyone in the house a drink, give me the bill.”
In disgust, the bartender says;
“What, no drink for me this time?”
The drunk replies;
“You! No Way! You get too violent when you drink!