I've got a few.
The first one was me going through a bandit camp. Turned out I'd caught them mostly sleeping aside from a couple sentries. I slew them by strangling them in their sleep. Which somehow had tired my adventurer out despite them not struggling in the slightest. But the bandit master was not asleep. And immediately had me on the back foot. I tried to fight defensively but it was no use, he knocked my character down via charge attack, causing them to lose their weapon and shield. Then cut my adventurer's head clean off in one stroke with his bronze scimitar. The former may have been caused by the actual decapitation, but I like to think there was a certain order to it.
The second one is another Adventure Mode story. And it also involves a bandit camp. In my current world, apparently a buffalo demon has taken over one of the bandit camps. And I'd stumbled on this with a previous adventurer that died to her. This time I came upon it (I'd forgotten which of the camps I'd discovered was this demon ruled one) with a couple companions. Well, since I obviously wasn't going to just let them charge in to die on their own, I went with them. That turned out to be a mistake since she tore my adventurer's foot off first. My companions managed to distract her while I tried to feebly crawl away. But they were no match for her. Then it was my turn, and I held her off okay, if by okay I meant she slowly tore me apart. My shield was only minimal help as she first mangled my other leg. Then my shield arm. And then finally put a stop to my attempts to strike her with my mace (which I'd bruised her with maybe 1-3 times) by grabbing my weapon. The arm holding it she pretty quickly broke with a punch, giving her possession of my mace. Which she then crushed my head with. The image of which you can see below.
The third (also Adventure Mode) story regards a quest to kill a cyclops. Required a bit of a trek (and some unnecessary swimming) on my part around either a large lake or coast of the sea. And I encountered not one, not two, but three cyclopes in the lair. Only one of them saw me, thankfully, so I lured him out by quickly booking it out of the lair. He had a mace but couldn't manage to hit me while I continuously chopped at him with my axe until he died of blood loss. Turns out that wasn't the cyclops I was after. Took the mace and lured out the other and pretty much repeated the process. Still hadn't completed that quest. So I ambushed the third cyclops from behind in the lair. Crippling strike followed by a pretty much repeat of the first two.
That was the cyclops I was sent to kill. Butchered the corpses and took the skulls back, kept the mace and went back for another quest. Ended up dying to a zombie that just wouldn't come apart like the others at a necromancer tower afterward.
Honestly, I find myself liking Adventure Mode more so than Fort Mode, this is part of it.