Big is a movie about a kid who gets his wish to be a grown-up, Jack is a movie about a kid who looks like a grown-up, Youth Without Youth is a movie about a grown-up who grows younger, and, well, the forthcoming The Curious Case of Benjamin Button appears to roll aspects of all these films into one.Starring Brad Pitt and Cate Blanchett and directed by David Fincher (Fight Club, Se7en, Panic Room), Button looks to be quite the drama-rama-- which may explain why some savvy marketing person decided to soundtrack a TV spot for the film with a portion of the Arcade Fire's grandiose, organ-saturated Neon Bible closer "My Body Is a Cage" [via The Playlist]. Check it: Big whoop, right? Songs are in movie trailers all the time. True, but the Arcade Fire have been especially particular about where and to whom they license their music, resulting in precious few crossover deals like this one. The Playlist report suggests the band made an exception in this case due to an admiration for director Fincher's work, something the Arcade Fire camp has yet to confirm. Oh, and lest there be any misunderstandings, the Arcade Fire are not doing the score for this one, either.The Curious Case of Benjamin Button is due in theaters Christmas Day (December 25).