I love fireworks. I've seen some crazy stuff happen out in the country (where you're allowed to shoot them in Texas.) The two best stories were:
1) Some dumbass teenagers were goofing around fighting with roman candles like kids do, but then they got real dumb and one of them kicked over a 3" mortar tube once it was lit. This thing goes blazing down the line of "firers", zips by me about 4 feet away, and I watch it explode about 5 feet off the ground, ~40 feet away from me about 1 or 2 feet from some girl's head. A giant burst of green flares, some of which flew right back by me, and then I looked up to see the girl collapse. She was badly burned and seriously injured. Fortunately they had paramedics on standby there.
2) In a similar setup, where tons of people are on line shooting fireworks off into the distance, these teenage guys and their girlfriends have amassed a giant pile of fireworks. They probably had as many as I did, (around $300 worth) but for some inexplicable reason, they literally put them all in a big pile on the ground. Well the guys had been shooting things off for a while, when one of the girls is like, "Let me try one!" So they give her one of those bumble bee deals with the little cardboard wings. Someone lights it for her, then she starts jumping up and down squealing once it's lit. Everyone is screaming "THROW IT!" Instead she gingerly tosses it into the pile of fireworks. Time stopped. I caught the terrified eyes of the boys, then looked over to my friend, exchange a nod, and took off running. That pile of fireworks went off at totally random intervals, shooting off random types of fireworks for about 5 minutes before the fire department drove up and hosed the whole thing down.
Fireworks are dangerous, mmmkay? You shouldn't use them if you're a dumbass, mmmkay? But even if you're not, you can still be seriously injured by dumbasses in your area, mmmkay?