The thriller genre uses suspense, tension, and excitement to drive the plot. It provokes strong emotions in audiences, especially suspense and tension. Thrillers have many subgenres and commonly feature danger of death for protagonists or others, antagonists that are initially stronger than protagonists, mysteries that must be resolved, and themes of justice and morality. Common elements include ominous music, knives symbolizing violence, mirrors suggesting hidden sides, and shadows creating mystery.