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You don't think a Halo movie would work... but you think a crazy Taxi one would? I'm gonna have to disagree... Halo has way more of a background story and character depth then Crazy Taxi... Halo would be harder to do... but it would be worth it...

.... in my opinion anyways... Soul Caliber Movie would be cool though... but only if Spawn is in it... and Zelda...
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