I don't know the first thing about horror movies, but I've been getting into H.P. Lovecraft recently and have been noticing more and more parallels between his work and the metal world. Not only are there many direct mentions to his works from bands such as Morbid Angel, Metallica, Therion, and Sentenced, but even his worldview is shared by many bands, in the form of his cosmic pessimism/nihilism, as well as a focus on ethnocentrism (not that I support this). I've half a mind to start a thread myself focusing solely on him and his contributions to the metal canon.