We also used to take apart fireworks and reassemble them in interesting ways...
My story is sort of a fireworks story. Just after one 4th of July, my neighbor, who was an older, geeky guy that still lived with his mom and dad (yes, he even had tape and glue holding his eyeglasses together and a pocket protector to boot) comes walking into my back yard with a brown jar.
In the jar, he explained, was sodium metal. The liquid it was in smelled like kerosene, and I imagine it was there so the metal didn't oxidize.
So he tells me to get a bucket of water, which I did - then he took out a pocket knife and cut just a little sliver off of this bar of metal (very soft metal), and tosses it into the water. The metal smoked and bounced around, crackling on top of the water. I was amazed that something reacted to water that way, and urged him to do it again. He did a few more pieces, and then told me to get a jar. I did, and he split what was left of the bar in two, and poured some of the kerosene smelling liquid into my jar.
Bad idea.
The very next weekend, with my parents at the cabin (I stayed home on weekends because I worked during high school), I decided it was time to play with the metal. I got a coffee can, filled it with water, and was soon giggling away as I tossed increasingly larger pieces of metal into the can. I still don't know to this day, what possessed me to do this, but I cut off a hunk metal about the size of a bottle cap, and threw it into the can.
Ka-blammmmmm!
Apparently I went past the threshold for the water to sodium ratio, and the chunk just about exploded, showering me with little pieces of sodium metal, which were wet, so they started burning me in tiny little spots all over my legs, arms and face. The spots burned fiercely for a day or so. I was scared shitless, so I took the jar, and hid it in the basement.
Well, I forgot all about the damned jar for over a year. One Saturday morning, I was at work, and my boss tells me my dad is on the phone, that he sounds upset, and wants to talk to me.
Well, all Dad said was "Get home now!"
I asked "why?"
"Don't ask why, you just get home NOW!"
I knew something was seriously wrong by his tone, and told the boss I had to go, he realized it too, and said "no problem".
So, I get home, and dad has fans in all the basement windows, blowing white smoke outward...
I get in the house and I see the jar I had forgotten about sitting on the steps. It was empty.
Turns out Dad had found it, looked inside, couldn't figure out what it was, so he poured it in the laundry sink, and turned on the water....
He had exposed about 10 times the amount of sodium metal to water than I had, when the coffee can blew up.

It scared the hell out of him, and of course, once the reaction started, there was no stopping it...
I was grounded for a month, and had to miss a canoeing trip I had been waiting all summer for...
'spose I deserved that.
