The document discusses techniques used in movie trailers. It provides an example of a teaser trailer that shadows the actors' faces and leaves out plot details to add mystery. It also describes research on trailers for the movies Alfie, East is East, and Pirates of the Caribbean to incorporate comedy. Specific techniques mentioned include using backing music to set tone, voiceovers to provide context, sped up music to indicate cocaine use, still frames and titles to denote comedy, and blurred point-of-view shots to show drunkenness.