This document discusses common conventions used in psychological thriller films and trailers. It covers elements like plot devices involving romance and jealousy that often end badly. Costuming typically features normal, casual clothes to portray mentally unstable characters as appearing normal. Settings frequently use isolated or dark locations, and cinematography employs low key lighting, close-up shots and point-of-view shots to create tension. Editing techniques like flashbacks, montage cuts and quick pacing build suspense.