The document analyzes 7 film trailers for possession horror movies to understand how to effectively promote such a film. All 7 trailers follow common conventions: showing the normal family life disrupted by terror, without revealing the full narrative resolution. They feature quick cuts between shots to build tension. Settings are isolated to suggest helplessness, and use of dark colors, religious props, and manipulated speech/sounds increase fear. Non-diegetic text leaves questions unanswered, enticing viewers. Analyzing these trailers provides knowledge of effective techniques to include ominous music, disturbing imagery, and a shocking climax in the author's own possession horror film trailer.