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Batman movies have long history of bringing out fans' batty side

(CNN)"Batman" swooped into theaters on June 19, 1989, helping set the stage for more blockbuster superhero movies as well as more adult, ambitious takes on the comic-book fare that, this century, has become the dominant movie genre in box-office terms.The run-up to the Dark Knight, however, also underscored a darker side of fandom, one that seems to become uniquely passionate -- and in some quadrants, enraged -- when it comes to casting actors to play Gotham's hero, from Michael Keaton to Ben Affleck to, now, Robert Pattinson.Twitter didn't exist when Keaton landed the role, but if it had, the entire Internet might have overloaded. Many longtime readers of the comics (including this one) wondered how director Tim Burton could tap a comedic ...