The thriller genre evolved from crime films developed by Alfred Hitchcock using techniques like tension from threats of violence. The Lodger (1926) was an early thriller that built tension, had elements of surprise, and an intelligent storyline. Most thrillers attract young adults who enjoy the rush of emotions and suspense. The purpose of thrillers is to create suspense and anticipation in audiences by emphasizing the danger faced by characters and building tension towards a nerve-racking climax. Classic thrillers mentioned are The 39 Steps (1935), The Third Man (1949), Rear Window (1954), and Frenzy (1972).