Avatar Trailer
This trailer clearly outlines the basic storyline. It first sets the scene: a disabled marine starting a new life on Pandora. It then shows us the problem: as the main character becomes more friendly with the natives, he becomes increasingly conscience of his moral responsibility to prevent the humans from destroying their land, eventually joining them in all-out war against his own species. What is left out is the resolution; we don't know how the film will end. This, combined with the dramatic presentation of the trailer, using music and special effects to create excitement, makes us want to watch the film.
 The titles shown in the trailer, interlaced with shots from the film, cause us to associate this film with others that we may have enjoyed, making us think that we would probably enjoy this one as well. The final title, shown in a distinctive font, shows us the name of the film.