I don't watch a lot of movies, or TV for that matter, so my input is going to be limited. I'll try not include any spoilers; reviews & plot summaries abound on the internet. 2001: A Space Odyssey (1968), directed by Stanley Kubrick. I find it interesting that Arthur C. Clarke wrote the novel 2001 based on the screenplay after the movie was released, apparantly in response to the large number of people who didn't understand the movie. I've known some people who were quite smug because they 'got' the movie; when pressed it turned out they actually saw the movie well after it & the book were released. My theory is only a handful of people involved in writing the screenplay and filming the movie actually knew what the hell 2001 was about. Memento (2000), directed by Christopher Nolan. The reverse chronological order isn't easy to follow. There are some parts of this movie that just didn't make sense, I need to see it again. Irreversible (2002), directed by Gaspar Noe. A French film where the story is presented in reverse chronological order. I found the movie more watchable as the manic pace slowed down. Warning: This film includes a brutal rape scene with graphic physical violence.