I know that Minecraft is abit under-rated and some of you wont have heard of it, But the Monsters on Minecraft just... just make me uncomfortable. Especcially spiders and squids. I am not scared of spiders, Hell, if there's a spider i'll be the one rescuing it from all the squeaming girls, But the blocky texture of mincraft and the awful sound they make is just... *shudders* Unbearable. I turn the difficulty to peaceful on Minecraft to avoid the monsters, and even when i play online with invincibility and All-powerful commands, Spiders still scare me. And squids. The squids with the rows of teeth and the blocky symmetrical tentacles. Eurghh...
Also, I know Fable is not a horror, But in Fable 2 & 3, Chesty and his special 'games' just make me feel sick. I know its all comical and the like, But the absolute immaturity of his words and the Chest itself is just scary. And the Sunset house from Fable 3, in the bad side. I cannot stand being there. It made my skin crawl just having my character stand there. Also, the bloodstone demon door event from Fable 3 with the winter house is just awful. Scary and uncomfortable.
Also, Dead Space with the fake 'corpses' and the Hunters, as forementioned.
And finally Oblivion, in the ancient dungeons and ruins. They are dark and the traps make me shake and jump.