What are your favorite horror/gore/very disturbing films

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There have been some pretty disturbing films recently that -- even if they're not great -- are just sick and downbeat enough to leave you pretty shaken for a while: the two I'm thinking of are WOLF CREEK and THE DESCENT.

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Dog Soldiers, by the guy who did The Descent is a fun movie. Special ops commandos fighting werewolves. Cannibal Holocaust is a pretty disturbing movie.