Horror films aim to provoke negative emotions in viewers by tapping into primal fears of death, the supernatural, and the unknown. Slasher films are a subgenre of horror that feature a psychopathic killer stalking and brutally murdering a group of people, usually teenagers, in an isolated location. Key characteristics of slasher films include identifiable victims, a "final girl" survivor, and the establishment of iconic killer characters like Michael Myers and Freddy Krueger during the subgenre's popularity in the late 1970s and 1980s. By the 1990s, slasher films incorporated more comedy and parody elements to engage bored audiences.