The document discusses what makes an effective opening sequence in films. It provides examples from several films and analyzes how their opening sequences accomplished specific goals such as arousing audience interest, establishing genre/theme, introducing characters, setting the scene, foreshadowing events, including encoded signifiers, setting tone, and creating suspense/enigma. For instance, the opening of Saw 1 arouses interest by showing a violent and mysterious scene that leaves viewers with questions. The Exorcist establishes its horror genre through use of red/black colors and ominous props during its credits.