It's a mad mad mad mad mad world

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"Warner Bros., the film's copyright holder (New Line Cinema, a division of Time Warner, distributed it), objected to the title Dark City early in the film's production. They felt the title would confuse audiences with Mad City, Warner's soon-to-be-released film starring John Travolta and Dustin Hoffman, which they predicted would be a commercial hit. The filmmakers changed the title to Dark World, but Steven Spielberg's production company threatened legal action, feeling the title was too similar to their film Jurassic Park: The Lost World. The title was then changed to Dark Empire, but legal action was again threatened, this time by Lucasfilm, who felt the title was too similar to their own well-known sci-fi film The Empire Strikes Back (and was an exact match for the Dark Empire comics that had been made about Star Wars) However, by the time the film was completed and ready for release, Warner's Mad City had come and gone from theatres and was not the hit they hoped it would be, and the filmmakers were allowed to use their original title, on the condition that Warner could use the original set of Dark City for The Matrix."