This video of a guy lighting a candle by setting his fart on fire is obviously fake. (Given that the video is one big fart joke, it's probably not safe for work, though it's otherwise work safe.) However, it seems that a number of people actually think it's real. To verify that it's fake, all you need to do is visit the url displayed on the film: sheepfilms.co.uk, which is the website of amateur filmmaker David Packer (aka Sheep). He has a lot of films starring himself that employ various special effects, such as fake fire farts.