Not really bike related but I'm proud of it and you guys are pretty patient. Got this lovely powderburn when I was Master Gunner aboard a tall ship. It's faded a lot in the last ten years;

We were just off Ventura California doing an exhibition sail. There wasn't any wind and the sea was rolly and it was hot and I had a wicked hangover. We had 2 little deck guns on each side and I would fire them with a lintstock (a 3 or 4 foot stick with a smoldering piece of rope tied to the end so you didn't have to get too close).
As we came around the other boat's stearn (firing blanks, no balls) I had my hand on the rail to steady myself. I reached forward and fired the forward gun, then I reached back and fired the after gun. My elbow was just over the touch hole.
They say the backflash has about as much force as a 22. It spreads out, though. Cannon grade powder is pretty course, like gravel and it embedded itself in my skin and smoldered till it was done. I always wanted to have little numbers tatooed next to each dot so that when you connected them it would make a picture of something nautical.