The trailer for Paranormal Activity uses techniques common to the horror genre to create mystery and tension. It shows scenes of a cinema audience reacting in fear to the film, leaving the viewer curious. Point-of-view camerawork and diegetic sounds put the viewer in the characters' shoes. Fast editing, dark lighting, and minimal music build an unsettling atmosphere. These techniques, along with an ordinary family setting and enigmatic title, entice viewers to watch the full film for answers.