The document discusses techniques used in horror movie trailers to build tension and establish atmosphere. It notes that slow, dolly camera movements; abrupt, short shots; shaky handheld camera work; and close-ups of faces are used to build tension. Non-diegetic music and sounds are edited in to further emphasize the abrupt editing and suggest that something bad will happen. The trailer uses contrasts between light and dark shots, saturated and desaturated filters, and certain color schemes to establish themes and unsettle the audience. Through these techniques, the trailer aims to create an unnerving atmosphere and leave viewers wondering what will happen.