The document discusses narrative conventions and structures in supernatural horror movie trailers. It notes that trailers may use linear or non-linear narratives, with the latter often employing flashbacks to reveal the supernatural entity's origins. Trailers also vary their restrictedness, with some revealing only that a supernatural presence wants to kill and others providing more context about its history and motives. Ultimately, supernatural horror trailers aim to leave audiences with narrative enigmas like why the entity exists and seeks revenge, how it came to be, who will survive, and whether its curse will continue.