So I know that sometimes a dwarf, especially a military dwarf, will go hang out someplace they've been recently, made a kill, did a job, the works. Still, I'm scratching my head at some things that happened in my current fort. Got a siege coming right now, and found some dwarf about to get slaughtered outside the walls in a spot she's never been to or even remotely near. Apparently, she's looking for a place to sleep. It's just an engraver-in-training when I have several legendaries, so she won't exactly be missed, but I'm still bewildered. At least her case is actually physically possible, however. The other one is not. I somehow had a miner get stuck in the drawbridge-trench of my third cavern entrance twice ... while the drawbridge was down, covering it. There was just no way to get down there. Fortunately for him, I noticed it the first time and dug him out before he would have starved (then walled the rescue tunnel off again, of course). The second time, during a big siege, he was not so lucky.
Earlier in the fort's life, I found a sheep on a roof with no way up or down, but since that was after a few attackers got in, I suppose it was a case of the known bug (?) of creatures sometimes dodging a z-level upwards.
Anyone else found a dwarf way out where they have no business being, or mysteriously teleported to an inaccessible spot?