Fart flamethrower(only will work for 40% of the world)

Basically, get a friend to have any sort of lighter, and make him light it right next to your rear, and fart into it. then, BOOM.

However, note that only 40% of people can produce methane(the part of farts that make the fire), and not all of your farts will produce methane(However, all humans produce methane through some part of there body in death, even through your mouth, but it'll almost always go through the rear at death).

You get a burnt but. Am I right?

It depends on how you fart and all that scientific stuff, along with where the lighter and you are, and the angle and everything, but considering everyones fart will be at different angles and speeds, there is no true right way.

How to fart fire (Easier way)
Eat hot sauce and tacos all day, and then fart.

Anyways, sounds original, great for party activities, 9/10