Fart lighting, (also calle fart-burning, blue dart, blue flame, blue angel and flatus ignition) is the practice of setting fire to the gases produced by flatulence often producing a blue hue. Although there is little scientific discourse on the combustive properties of flatus -- perhaps because of its vulgar and juvenile nature -- there are many anecdotal accounts of flatus ignition, and the unique activity has increasingly found its way into popular culture with references in comic routines, movies, and television; including cartoons.