I recently had two accidents occur that I sorta facepalmed at. The first, a doctor was moving by the pit outside I have that goes straight to magma. A wandering raccoon apparently tried to pickpocket him, and he dodged into the hole.
The second was completely my fault. I have a drawbridge protecting the front of my fortress. I had just gotten a seige, and was in the process of getting my civilians inside. [I was building a road to the edge of the map, so there were quite a few masons out there.]
Anyways, I knew I wasn't going to get the last two in intime, so I sent my military to intercept. One dwarf.. one crazy, brave motherfucker, was first on the scene, taking on a troupe of trolls, holding them off long enough to get the dwarven masons inside. Then my military showed up and made short work of the trolls. Now here's the accident:
I withdrew my squad to the entrance, because the rest of the seige was close and I didn't want to lose my fighters. I ordered them in, and they crossed the bridge right as the goblins showed up. Then, the civilian I had ordered to pull the lever operating the bridge showed up. Happily, he performed his duty, and a second or two later, the bridge raised.. right as the same dwarf from before was crossing it. He was flung through the air, and landed back on the other side of the bridge, in the middle of the goblins. Everyone else had made it, even the civilians. I couldn't do anything but watch as he stood, turned, and fought the entire seige by himself. I didn't have full equipment at this time, so it wasn't long before he was skewered and killed.