Horror is a film genre seeking to elicit a negative emotional reaction from viewers by playing on the audience's primal fears. Horror films often deal with viewers' nightmares, fears, revulsions and terror of the unknown. Plots within the horror genre often involve the intrusion of an evil force, event, or personage, commonly of supernatural origin, into the everyday world. Prevalent elements include ghosts, extraterrestrials, vampires, werewolves, demons, gore, torture, vicious animals, evil witches, monsters, zombies, cannibals, and serial killers. Movies about the supernatural are not necessarily horrific.
