This document discusses the conventions of horror movie trailers. It explains that trailers are designed to promote films in a visual way by showing exciting clips out of chronological order. There are two main types of trailers - teaser trailers that are short and released early during filming, and longer theatrical trailers released later. Effective horror trailers use shots from the film with dialogue or voiceover to set the scene, dramatic music to create atmosphere, text cards for information or atmosphere, and end with a scare to leave viewers wanting more. The structure of trailers shows an initial equilibrium, a disruption of events, but does not reveal the final resolution to avoid spoilers.