Just heard this last night.
A guy walks into a bar and goes up to the big, burly bartender. He orders a drink and says, "You wanna hear my latest banjo joke?"
The bartender says, "Sure, fine, but I gotta tell you, I'm a banjo player. And you see that big, mean-looking guy at the end of the bar? He's a long-haul trucker, and he's a banjo player. So's the guy over by the dartboard with all those darts in his hand. Now, you still wanna tell that joke?"
The man looks around and says "Nah, I don't want to have to explain it three separate times."