http://img375.imageshack.us/img375/7364/sspx0075.th.jpg
I had an empty fridge keg lying around and I thought, "what the heck, why not recycle?" Tosses golf balls nice and hard at 80psi.

http://img256.imageshack.us/img256/9152/sspx0078.th.jpg

Did this to some 3/8" Particle board I had lying ...

Any auto-electric spark coil will work as well you just need a 12+ volt source I.E. Coulple of 9v batteries in series, 8 or more AA, ect. just wire in a momentary switch and you're good to go.

I loaded up the 'ol 3" wye cannon (Sch 40 3" wye) with a spud and the cutting torch (Oxy-Acetylene)

Best shot I ever got out of it! Left a big cake of black ash in the back of the chamber (think I had her a little rich)

Btw I know a guy that was trying the 'ol Fill-A-Garbage-Bag-Up-Off-The-Torch ...