In a mindfucky mood? Check out Stay (2005). Fantastic performances from everyone involved, and I thoroughly was hooked till the very last 10 minutes, where you go "OHHHHH I FUCKING GET IT" because it leads you on for a good 3/4s of the movie and keeps you guessing.
Also, Moon (2009). This came out last year at some point, but I can't recall ever seeing ads for it, or it being in the theatre for that long if at all. But, it is in the same flavor as the movie above. You think you understand whats going on, then the movie reveals what actually is happening about a little past half way through. Even though it does this, you're still hooked because of the amazing job being done by Sam Rockwell, and the story in general. Think 2001: A space odyssey but shorter and a tiny less gloomy. Future-Sci-Fi Psychological Thriller, I loved it.