Weird, I swear I saw that episode on 1000 Ways to Die on SpikeTV.

Episode 10:
77 Red, White and Blew July 4, 1983 Happy's Trailer Park
Lawrence, KS A group of rednecks attempt to celebrate the Fourth of July by launching a homemade firework from a homemade launcher. When it fails to work, one of them looks down the barrel of the launcher, and the firework explodes in his face, shattering his skull into his brain. (Note: This clip features a Wilhelm scream)