Walks Into a Bar... Donkeyboy

Bob and Jim walk into a bar. Bob says, "Hey Donkeyboy, get me a drink." The bartender gets him a drink.Bob says, "Donkeyboy, get me another drink." The bartender gets him another drink.Finally, Jim asks the bartender, "Why does he call you Donkeyboy?""I don't know. Hehaw-hehaw-he always calls me that."