It’s OK for a movie to be stupid if that’s what it’s trying to be. “Super Troopers” (2002) is to trying what India is to people, and it’s to stupid what maple syrup is to sweet. It’s an R-rated version of “Police Academy: The Later Years,” but with Vermont/Canadian hijinks, which are slightly more interesting since we don’t get up there so often. The humor is divided between sight gags, sexual innuendo and “Beavis and Butthead” style wordplay. Except some of the cops actually get laid occasionally. Oh, there’s also a thin thread of a plot involving murder and marijuana.