I didn't really do anything too mischevious or out of order. My brother on the other hand...
He and two of his friends found an ammo cannister in the alley. They picked it up, saw that it had a little gunpowder in it apparently. Intrigued, they proceeded to try an expiriment. They added some newspaper and some plastic army men. Looking more deeply at it, they decided that it needed one last thing. They went into the garage and grabbed the bottle of gasoline and poured it into the ammo canister. It was all set. One of them lit the match and dropped it from a height of about five feet. The resulting fireball nearly took off his eyebrows. Aside from a slight burn on the concrete driveway, though, there was no other evidence of it...yet.
Not quite done with their mischief, they went back into the garage and found two baseball bats and an axe. Deciding that the fence was in need of repair, they proceeded to chop up nearly half of it before I finally heard what was going on (I was inside the house, in an area where I cannot see the driveway or backyard, doing homework and listening to music). I ran outside and had them drop all of that stuff and followed them around like a hawk until mom got home from work. She went ballistic. But she still did not know about the ammo canister and gasoline. My brother claimed he had no idea why part of the driveway was black or why there was a heat-deformed ammo canister lying around.
Skip forward four years. My mom was out running some errands and stopped by Eckerd's. Thinking she was picking up some film from a recent vacation, she opened the package. She was greeted by pictures of the flaming ammo canister and the boys chopping up the fence. My brother had his ass chewed out again