It was my first playthrough and I was getting myself hopelessly lost in the Ratway. I was getting mugged at every step, stumbling into bear traps and getting bashed in the face with flying weaponry. At last, I made it to the Warrens, panting and bloody, my blades smeared with the remains of all the muggers I'd had to fight through. And then I had a run-in with that cannibal chef and really freaked out, brutally slaughtering him as well. The sound of the fight awoke Salvianus and Hefid the Deaf and I heard them screaming for mercy from their room around the corner. I ran over to them, ready for another fight for my life, desperate bloodlust in my heart. But they didn't attack. They just cowered in their corners, their hands over their heads. I calmed down a little, decided to let them live and sheathed my blades. Salvianus said it just when I had begun to walk away.
"Ha! I knew you didn't have the stomach for it!"
Something broke in my brain just then. I'd been stuck in the Ratway for an hour and had no idea how to get back to the surface. I'd been walking in circles for just about that entire time and was getting no help from the locals. I'd gone a little stir-crazy and was capable of anything right at that moment.
"Oh, don't I?" I whispered aloud, drawing my blades again as the two of them laid back down on their bedrolls. I killed them both before they could react. A defenseless deaf girl and an aged veteran of the Great War. It was awful, by far the worst kill I'd ever done. Up until this point, my character had been an honorable warrior, the respected thane of several holds, a friend to anyone in need. She couldn't reconcile that persona with the disgusting thing that she'd done. It was honestly the sheer evilness of this event that made me ditch that character and start a new one very shortly after it happened.