Aesop has provided a very graphic image of the damage a firework can do to your hand if it's treated carelessly. I'm not going to reproduce it here on a family-friendly blog, but if you have children (or adults!) who are careless with fireworks, you could do a lot worse than make them look at it. It's shocking and nauseating, but it's what happens when you play with danger.
Fireworks are fairly common in the USA, but in Britain and her former colonies their use is concentrated around Guy Fawkes Night (November 5th). I was a volunteer with St. John Ambulance in South Africa, and we used to dread that time of the year. We knew we'd see people with fingers, even hands, blown off, or eyes put out, or faces burned, torn and lacerated by the explosion of a firework. Many of the injuries were beyond easy repair, requiring plastic surgery to reconstruct them; and some couldn't be repaired at all (missing fingers are hard to replace).
The worst injuries were in mining communities, where access to explosives wasn't hard to arrange, despite stringent security precautions. Blasting caps provided very loud bangs in their own right, even if not attached to a quarter- or half-stick of dynamite. What's more, there were always idiots who'd try to crimp them onto a fuse using their teeth - resulting in shattered teeth, broken jaws, and torn tongues. You'd think their colleagues would have learned from their misadventures, but no . . . every year, the same damned thing happened again. I guess it was a combination of macho and human stupidity.
As Einstein put it: "Only two things are infinite, the universe and human stupidity, and I'm not sure about the former." We ambulance volunteers were more than sure about the latter! If Aesop's gory image can help cure some of the stupid before they're forced to live with the consequences of their stupidity, so much the better.