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. Other colors of flame such as orange and yellow are possible with the color dependent on the mixture of gases formed in the colon. In order to "fire fart", one must have a fart prepared in the anal cavity, and a lighter at the ready. Then they fart onto the lighter.

In 1999 author Jim Dawson observed that fart lighting has been a novelty practice primarily among young men or college students for decades, but is discouraged for its potential for causing injury. Such experiments typically occur on camping trips and in single-sex group residences, such as tree-houses, dormitories, or
fraternity houses . With the advent of video sharing features online, hundreds of self-produced videos, both documentary as well as spoof, have been posted to sites such as YouTube .

The people appearing in the videos are predominantly young males. In his book The Curse of the Self: Self-Awareness, Egotism, and the Quality of Human Life author Mark Richard Leary explains how a great deal of unhappiness is due to people's inability to exert control over their thoughts and behavior and that "stupid stunts", including lighting flatulence, were a way to make an impression and be included in group bonding or hazing.

Although there is little scientific discourse on the
combustive properties of flatus, there are many anecdotal accounts of flatus ignition and the activity has increasingly found its way into popular culture with references in comic routines, movies , and television ; including
cartoons . In Electric Don Quixote: The Definitive Story of Frank Zappa author Neil Slaven quotes
Frank Zappa for calling fart lighting "The manly art of fart-burning", and another book quotes the musician Kenny Williams for saying that it demonstrates " compression , ignition ,
combustion and exhaust ."

There have been documented cases of
flatulence during surgery being inadvertently ignited causing patient injury and the risk of death.

https://en.m.wikipedia.org/wiki/Fart_lighting