The document discusses key conventions of the thriller genre including suspense, surprises, cliffhangers, and tension. It notes that thrillers keep audiences on the edge of their seats with unpredictable plots that are driven by villains. The document outlines common thriller elements like protagonists facing danger, chase/fight scenes, and intense climaxes. It also examines three thriller subgenres - crime thrillers involving violence and murder, mystery thrillers where characters uncover truths, and psychological thrillers where characters face mental/emotional problems from antagonists or their own minds. Sample trailers for films in each subgenre are analyzed to show how they incorporate typical thriller conventions.