The NYTimes: Forget buckets of blood. Nothing says horror like one of those tubs of artificially buttered, nonorganic popcorn at the concession stand. That, at least, is one of the unappetizing lessons to draw from one of the scariest movies of the year, “Food, Inc.,” an informative, often infuriating activist documentary about the big business of feeding or, more to the political point, force-feeding, Americans all the junk that multinational corporate money can buy. You’ll shudder, shake a