[ripdog]

Go buy a large metal pipe that is threaded on both ends, two end caps, a tube of silicone sealant, some fuse, and a couple of cans of FFFF gunpowder (tell the gun shop owner that your uncle has a muzzle loader and asked you to pick it up for him if he asks). Drill a fuse sized hole in the center of the pipe, insert the fuse, and smear some silicone around the base of the fuse. Screw one endcap on, then dump your powder into the pipe. Liberally coat the threads of the pipe with silicone and very carefully screw the remaining cap on. Don't be anywhere near this thing when it goes off. It should be pretty cheap to build and the thrill of possibly killing yourself is way more exhillarating than maybe losing a digit or your hand. Also, if you're within 200 yards of this thing when it goes off, the concussion will blow your mind and make chandeliers swing for blocks.