I came ridiculously close to blowing my hand off as a kid, the one kid in my circle of friends with the internet printed out a few copies on his dot matix printer.. anyway one Saturday morning a group of us decided to try make a tennis ball bomb, it was just snapped off matchstick heads and the strikers stuffed through a small cut in a tennis ball and then tape the ball up. So pooled all out money together and go a dozen boxes of matches, tennis ball and a roll of duct tape and sat at a table in the park snapping off match heads. Once we made it we headed back to one of my mates flat and someone threw it up again a wall while the rest of us hid behind a wall looking over and... Nothing it hit the wall and bounced off and rolled around before stopping on the ground, we all waited and after a few minutes someone gave it another go with the same result, after about 10 attempts we were all out and just picking it up immediately off the ground and throwing it again. After about 15mins it just turned into a game of us throwing a ball against the wall and catching it before it hit the ground... Now I ran to catch the ball off someone else's throw and i was about a foot off catching it when it exploded with a fucking boom, bits of tennis ball flying all over the place, you couldn't see the shit but you could feel it hitting you on the way passed. Our reaction was fuck that was cool, let's make another one..