Artist and sculptor Ariel Schlesinger somehow (his site is down, so the guide is AWOL at the moment) replaced an air horn's compressed air tank with butane to create what we can only refer to as a fire horn. Awesome.
It's not self-lighting and the flame is kind of weak, which puts it one step below a serious flamethrower, but on the other hand it still lets loose with that always-hilarious BWAAAH! air horn sound when the trigger is pulled. Check out the video below for some BWAAAHFWOOOSH! fire horn action. [Ariel Schlesinger via Hackaday]