A Scanner Darkly

A Scanner Darkly was a dark (sort of sci-fi) movie starring Keanu Reeves. It's about a small group of addicts hooked on a drug called Substance D which is highly addictive and difficult to recover from without sustaining permanent damage. Despite the heavy topic it had several humorous scenes courtesy of Robert Downey, Jr., reminiscent of John Goodman in The Big Lebowski. It had a few unexpected twists at the end (which I always appreciate). If you haven't seen this yet, I recommend you put it on your list of movies to rent.