Oldboy

An Incredible, brutal, fantastic masterpiece of Park Chan-wook that really put Korean cinema on a pedestal, with probably the best choreographed action sequences I got to see (The corridor scene will always give me goosebumps), some of the best looking shots, and an incredible story with an fantastic score to accompany all of this. Definitely one of my favorite movies of all time, which I would recommend to everyone, if you can handle a few very graphic scenes