The document discusses conventions of horror movies, including subgenres like slasher, supernatural, and hybrid genres that combine elements. It provides examples of subgenres like extraterrestrial and monster films. Slasher films involve a psychopathic killer murdering victims violently with a signature weapon, while supernatural films depict unbelievable abilities and unnatural events. The document analyzes how two films from 1976 and 2014 both fit in the thriller/horror subgenre by involving paranoia or hallucinations, showing how the subgenre continues to be popular and reimagined over time.