For me its the dead zone, for some reason im terrified of it and whenever im in a really deep biome i get freaked out and go back to the safe shallows lol
I don't scare easy, just yesterday I almost got run over by a car.
If I didn't dodge in time I would be in the hospital right now, however, the whole thing pissed me off rather than scare me. So you really think a game can scare me when a real life threatening situation does not?