I just had the first moment where I thoroughly enjoyed DF personally(not just laughing reading the wiki and whatnot) Anyway here's my story:
Me being the smart Fortress leader that I am, decided to dig into a underground cavern for the precious precious gold that was literary everywhere down there. Of course there wasn't going to be anything bad down there, right? I was wrong. After letting the miner go about their business down there I went to continue designing the grand scale gladiator arena I had been planning for a while when suddenly I get: "Aludsibrek cancels Make gold Crafts: Interrupted by Troll". Suddenly all hell breaks loose as a troll is now running wild in my fortress, killing all my dogs. As I hadn't had time to build a militia yet I put one together out of a planter, a fisherman and a couple filthy migrants. Obviously they didn't have any weapons so they start pounding the troll with their fists. And after knocking out several teeth and spraying vicious cyan blood and vomit throughout the fortress they finally manage to incapacitate him all while continuing to hit it. Turns out they just can kill it with their fist so they keep on hitting it until the troll, now missing just about all it's teeth walks into a cage trap while phasing in and out of consciousness. Guess I just got the first combatant for my arena.
I took a screenshot too for anyone interested.