Memento
(2000)
One of the best films of the year. Revelation piles on revelation, and the viewer is left just as much at sea as the protagonist, who suffers from anterograde amnesia: he can’t remember anything more than a few minutes ago, and yet still manages to discover the causes of his predicament through imagination and determination. I can’t recommend this highly enough. In fact, just writing this has made me want to see it again.