When I was in primary school we were studying the Second World War. Anyway some kid brought in a hand grenade that his grandfather found in France and had handed down to him! The teachers found out and they put it in a bucket of sand in the middle of the playing field, and nobody was allowed outside until the bomb squad came and took it away. It turned out that the grenade was actually live as well!
In high school I almost got suspended a couple of times. I learned how to pick locks, and I took a padlock of someone's locker and didn't put it back, but I didn't look inside. It turned out that the person's shoes were stolen from the locker! I ended up just having to buy her a new lock though.
Another time I almost burned the school down while playing with fire, and shot someone with a BB gun within the same week. The crazy thing was I didn't even get a detention for either!