For horror stories to give readers a suitable amount of gooseflesh, the author has to establish the sense of fear. There are many types of fear. I have a fear of heights but not everyone identifies with acrophobia. The horror writer must generate a universal fear. The majority of people have a fear of being isolated in a dark, strange place, which can be delightfully effective. Most importantly, just about everyone identifies with the fear of dying, which happens to be the crème de la crème in horror writing. And, of course, snakes, rats, spiders, and other creepy-crawlers can give just about anyone a case of the shivers.