Horror is a wonderful, if sometimes confusing, genre. It spans countless wonderful and horrifying books, films and video games - all of which have a varying success at generating fear, dependant on the person experiencing them.
While, say, the film Arachnophobia is painfully spooky watching for all of us who get itchy near even a regular house spider, for those without any fear of the eight-legged menaces, it's probably a boring time. Similarly, I.T isn't half as bad to sit through if you don't consider clown the most horrifying godawful creation humanity ever cursed the Earth with.
The reverse, however, is also true - while some horror falls flat in scaring us for whatever reason, some stuff we wouldn't naturally consider horror can terrify us. This is especially true in the land of video games, where series and instalments that seemingly weren't supposed to be horror games can easily be interpreted as such.
Unless you're not even vaguely unnerved by nightmarish sea monsters, uncanny mall mascots, and a hefty dose of existential horror - in which case horror is probably a genre that doesn't exist for you anyways.