Not even ‘The Dark Knight’ filmmakers were sure about Joker’s origins

You know The Dark Knight was one of the most complex superhero movies ever. But did you know these seven surprising behind-the-scenes factoids?

Our CineFix series, Things You Didn't Know, brings you things you didn't know about your favorite movies—and in this case, things even the filmmakers didn't know, like the true origins of the Joker.

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