A brown bear walks into a bar, sits down and orders a hamburger. He eats the burger, then pulls out a gun and shoots and kills the waiter.
As the brown bear is leaving the bar, the bartender shouts, "Hey! Where do you think you're going? You just shot my waiter and you didn't pay for the burger. You can't leave!"
The brown bear yells back, "What's your problem, I'm a brown bear. Look it up in the dictionary!"
The bartender opens his dictionary to the words "brown bear": "A large furry mammal found in forested areas of North America. Eats shoots and leaves."