It looks dangerous—because it is—but there's more to fire breathing than meets the eye. In order to do it safely, you need to think about the science involved, and this video explains why.
It's not just a case of spitting out some fuel: you need to consider the volatility of the fuel, the oxygen in the air, and then nail the technique, too. It perhaps goes without saying that you probably shouldn't try this at home. [YouTube]