Must read (This is a personal list, so I'll remove those entries I already started/ended)
I've judged these based on their re-readability (e.g. would I read it again and again?), whether I'd recommend them to others, how much of a kick I got out of reading them and how much of an...
Very messed-up, major mindfucks, things like that. Really grim and dark and make the reader go "Nooooo!!!/Whaaaat?"