My most emotionally distressing nightmares are always the ones where someone I love gets hurt or killed. They're actually pretty boring to talk about.

I did have one that wasn't too disturbing emotionally, but it didn't seem like any of my normal dreams, at all. It was very dark and violent, and even the setting looked completely different from anything I'd ever dreamt about. For instance, the sky was red, and overcast. No sunlight in sight. Every object around me looked like it was decaying. The buildings had broken windows and were abandoned, cars were strewn everywhere, their paint flaking. Garbage and scrap metal littered the ground. Rust as far as the eye could see.. You could get tetanus by just looking at it for too long.

It also involved a caged knife fight between two high-school age boys. One quickly got advantage of the other cut him up for a while, and then started prying his vertabrae apart, starting from the bottom, gradually paralyzing him.

That shit was messed up. I think I might have traveled to a different dream plane or something, because that was the first and last time I've ever dreamt anything like that.