The document discusses conventions that are commonly used in thriller movies and trailers to create suspense and a sense of realism. It notes techniques like dark lighting, pale faces, exaggerated sound effects, plot twists, false alarms, dramatic music and colors, and relatable but not realistic scenarios. These conventions are then analyzed as used in the trailers for movies like "Insidious," "The Ring Three," "Don't Be Afraid of the Dark," and "The Roommate." Facial expressions and makeup are also discussed as important for thrillers, with an example given of how special effects can transform an innocent object or character to look scary.