Pontypool (2008)

The film is set in a radio station in Pontypool, a small village in Ontario, Canada, where one day the morning team starts taking reports of extreme, bloody incidents of violence occurring in town. As the story unfolds, the radio staff soon realizes the violence that is ripping society apart is due to a virus being spread through the English language. That in turn poses a problem for a yappy radio jock and his staff holed up in the broadcast booth housed in the basement of the town's abandoned church as a slaughter rages beyond its walls.