When i first read the description of this video, i thought that it was a typing error... A flamethrower trombone? Who on earth would make such a thing? WFFFxakaxWill did! The trombone is fully functional and has a fireball on demand:
It is made up from plumbing, torch, and compressed air parts. It took about two weeks and a couple of weekends to complete. It has a 21 foot range with the fireball, and a concussion wave of 150 feet. It can be difficult to play since it has a recoil.