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World's Greatest Dad is by far the most disturbing movie of 2009 starring Robin Williams as a high school teacher and father to Kyle, played with a foul mouth and a mean spirit by Daryl Sabara.

Everyone at school hates Kyle, but after Kyle accidentally kills himself, he becomes a posthumous celebrity, and so does the guilty father.

World's Greatest Dad is the darkest of comedies, and oh so difficult to watch, and that's the clear intention of writer/director Bobcat Goldthwait. You'll either walk out abused and shocked, or you'll embrace the gallows humor.

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