Any film which calls itself a documentary, (and probably is, given the technical definition of that genre) but is actually a blatant opinion-piece.
Socialist 1: Did you see Michael Moore's new flick?
Socialist 2: Nah, if I was gonna waste my time watching a docupinionary I'd rather watch that internet movie, Zeitgeist.
Socialist 1: But they are both left wing ideological movies!
Socialist 2: I know, I just hate Michael Moore 'cause he's a fat fuck.