David Silverman, longtime Simpsons director and director of the forthcoming Simpsons Movie, is more recently better known as The Flaming Tuba Guy.
He crafted a sousamaphone that spurts fire while he plays (video link), as detailed in this BoingBoing post.
An NBC Tonight Show producer thought this sounded neat, and as a result, David will be appearing on the Tonight Show this Friday, June 23, "Tubatron" and all. Go smoke 'em, David!