Back in the 70’s a friend of mine was priming a full size cannon ready to fire and the second he touched the (copper) flask to the touch-hole there was a terrific flash and he ended up at the local hospital with severe burns to his hand, arm and side of his face, now whether or not this was caused by static we’ll never properly know but that’s certainly the reason we chose to believe and yes, I’ve seen the videos of the lab tests of powder and electricity but I still wouldn’t take a chance!