I think my list will be growing with the new Honour Mode. I thought I'd give it a try last night. I wasn't too far in, I was at the ancient ruins. I had just talked the group of looters into leaving. Next thing I know, they fall through the cracked floor and get cornered by the looters inside. I was only level 2, I didn't stand a chance because the only way out of that room you fall into is through the enemies. I hadn't shot down the cinder block or anything. The group outside had left. I think my party just stepped on it.
So I started a new save as a deep gnome DUrge paladin. I was doing ok at first. I had heard the owlbear was "tough" so I avoided that until level 4 and went back for it, thinking that was a safe level. Next thing I know, "SURPRISE!" and the mama bear summoned her mate. I had just about managed to flee with Gale when the second owlbear crush leaped him.
I'm now on my third Honour Mode attempt. I'll report back once I've died very stupidly because I know I will.