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![Fart lighting](http://upload.wikimedia.org/wikipedia/commons/thumb/c/c0/Fartlight.jpg/300px-Fartlight.jpg)
Fart lighting, also known as pyroflatulence or flatus ignition, is the practice of igniting the gases produced by human flatulence, often producing a flame of a blue hue, hence the act being known colloquially as a "blue angel", "blue dart", or in Australia, a "blue flame". The fact that flatus is flammable, and the actual combustion of it through this practice, gives rise to much humorous derivation.