bait and switching, they can allow the audience to have a great viewing experience that they would not ordinarily have. However, the opposite is true too, with the promise of great trailers being let down by mediocre films. An American woman sued the makers of Drive because their film "failed to live up to its promo's promise", although her lawsuit was dismissed. In August 2016, an American lawyer attempted to sue Suicide Squad for false advertising over lack of scenes including Joker. Composition Trailers tell the story of a film in a highly condensed fashion to have maximum appeal. In the decades since film marketing has become a large industry, trailers have become highly polished pieces of advertising, able to present even poor movies in an attractive light. Some of the elements common to many trailers are listed below. Trailers are typically made up of scenes from the film they are promoting, but sometimes contain deleted scenes from the film. The key ambition in trailer-making is to impart an intriguing story that gets film audiences emotionally involved. Most trailers have a three-act structure similar to a feature-length film. They start with a beginning (act 1) that lays out the premise of the story. The middle (act 2) drives the story further and usually ends with a dramatic climax. Act 3 usually features a strong piece of "signature music" (either a recognizable song or a powerful, sweeping orchestral piece). This last act often consists of a visual montage of powerful and emotional moments of the film and may also contain a cast run if there are noteworthy stars that could help sell the movie. Voice-over narration is sometimes used to briefly set up the premise of the film and provide explanation when necessary, although this practice has declined in the years after the passing of voice-over artist Don LaFontaine. Since the trailer is a highly condensed format, voice-over is a useful tool to enhance the audience's understanding of the plot. Hollywood trailers of the classic film era were renowned for clichés such as "Colossal!", "Stupendous!", etc. Some trailers have used voice over clichés for satirical effect. This can be seen in trailers for films such as Jerry Seinfeld's Comedian and Tenacious D in The Pick of Destiny. Music helps set the tone and mood of the trailer. Usually the music used in the trailer is not from the film itself (the