We did that as kids--electrolysis. Hooked a sparkplug into the top of a BIG glass jar, got the hydrogen (I think--I wasn't the brains of the crew) into it, got back a goodly distance, caused a spark and it went boom. It was fun. Well, until our experimentations caused a fire in the field which made the firemen come. We stopped that very day. I am sure somewhere in my subconscious that they are still looking for the culprits so I will sign off.

Dave Arnsweller