Thriller films use suspense, tension, and excitement to stimulate the viewer's emotions and create anticipation, expectation, uncertainty, and anxiety. They tend to have fast-paced, gritty plots. Horror films aim to elicit negative emotions from viewers by playing on primal fears using scenes that startle and themes involving the macabre, supernatural, and viewers' nightmares. Psychological thrillers emphasize the unstable psychology of complex characters and incorporate elements of mystery, drama, horror, and psychological horror to explore moral ambiguity and dissolving realities.