The document discusses conventions for openings in thriller films. It states that thriller openings aim to entice viewers to continue watching by establishing the genre, setting up main characters and landscape, and conveying the overall tone. Common techniques include panning shots, narration, title sequences, and flashforwards or flashbacks. Most thriller openings depict either a seemingly normal situation that has something "off" or an abnormal situation. They blend into the overall plot of the film so it's hard to determine their exact length.