Why do chefs set pans on fire?
Fat flares can happen in any kitchen in the right conditions (even at home), say when something is being vigorously stirred and a bit of hot fat splashes down the side of a pan and ignites, trailing back to the pan itself and giving a quick burst of flame.
Why do you ignite alcohol when cooking?
The alcoholic beverage must be heated before lighting it on fire. This is because at room temperature, the liquid is still below the flash point, and there are not enough alcoholic vapors to ignite. By heating it, the vapor pressure increases, releasing enough vapors to catch fire from the match.