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."