I watched Glengarry Glen Ross with a friend once, and the whole thing went completely over her head, and she just described it as a film about people talking, and used that classic phrase 'nothing happened'. It really makes you wonder what she expected to happen, and also maybe it says something about the state of modern cinema, how movies are sold and marketed, and what people expectations are from watching a movie.
Stonking film, isn't it? It's practically a filmed stage play but utterly compelling. Up there with Twelve Angry Men
(which is of course a stage play).