does anybody know a cheap, easy way to make high voltage?
Danger, Danger! Will Robinson.. L
Holy Mother of Monkey! That video is awesome!
2003 though... that was a while ago L
How much high voltage are you shooting for? A tv flyback transformer with some accompanying circuitry makes nice high voltage. You can get a Model A (old ford car) coil. A neon transformer makes a great plug in high voltage. There's the Van-degraff machine. Or the Tesla coil. Take your pick.
What do you think the best one is for igniting a potato cannon?
The ignitor off a fireplace butane lighter is perfect for that. They run about 2 bucks in the dollar store. Just make sure it is a piezo lighter not the flint kind.
. Scuff your shoes across the carpet in a room with low humidity. Some combinations of shoes/carpet work much better than others. This should be free (in most cases) and nearly always easy.