Pontypool is a siege horror movie with an terrific terrific twist that I dare not disclose. Stephen McHattie plays Grant Mazzy, a grizzled DJ who's stuck in the middle of Nowhere, Canada radio station, liquoring up his coffee while he reads school closings. A series of strange events occur in town, culminating to all-out violent anarchy, and it's all conveyed to us through callers to Mazzy's radio show. The sound people and actors sell the terrifying happenings in town amazingly…