So you might have guessed it.
The Dark Knight
The first time I've heard about this movie I thought it was gonna be another lame superhero useless junk movie sort of thing. However, once I saw it, I was amazed how good it was.
"Batman, Gordon and Harvey Dent are forced to deal with the chaos unleashed by an anarchist mastermind known only as the Joker, as he drives each of them to their limits."
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