It was in summer camp... There were groups of different ages in the same camp, three age groups in total, think of it as elementary, middle and high school, and I was in the middle age group, or borderline between lower and middle. There were much older guys like 16-17 years old vs me who turned 11 that summer. I was getting bullied a lot by the older guys in regards to access to game room equipment like foosball and pool tables. I procured a box of pencil stick firecrackers that I messed around with a lot. I blew apart a dead tree, some glass bottles, and made other kinds of messes. So one day after another round of bullying I found the older guys showering and decided to teach them a lesson by tossing one of my firecrackers into the showers, I figured the sudden pop in an enclosed space would give them a proper scare. I lit the firecracker but then remembered how much damage they can do, and got concerned that someone might lose a toe if it lands next to their foot, and I chickened out. But it was already in my hand and lit. So I tossed it into the nearby toilet adjacent to the showers, hoping the water in the bowl would put it out. When it blew the porcelain toilet cracked and split, and the water and everything that was in the toilet bowl was dripping off the ceiling and running down the walls, and there was a foggy haze. The carnage was epic, there was even toilet water inside the ceiling light. Somehow I got the respect of older guys after that. Odd. Camp staff were searching for who had done it but nobody said anything. It was a pretty good lesson in physics though, and a good reminder not to mess around with firecrackers however small they may look. Some of the small ones can be pretty potent.
Did you do any extracurriculars while you were in school?