A guy walks into a bar and whispers something to everyone in the bar. As he whispers to them, one by one, the customers stop what they're doing and turn to watch him.
Finally the guy goes up to the bartender and says, "I'll bet you a thousand bucks that you can pour beer all over this bar and throw a lighted match on it, and it won't catch fire."
The bartender thinks that's weird, but he wants the thousand bucks, so he says "Okay, I'll take that bet."
The bartender fills a mug with beer and dumps the whole mug out onto the bar. He lights a match and throws the match on the beer. The bar immediately catches fire.
The bartender grins and says, "Well, I guess you owe me a thousand dollars."
The guy shrugs and says, "That's okay. I bet everyone in this bar five hundred dollars I could get you to set fire to your bar."