Ong Bak: The Thai Warrior (2003)
Ong Bak: The Thai Warrior, directed by Prachya Pinkaew, is the film that made Tony Jaa an international celebrity. It boasts wall-to-wall action sequences featuring some bone crunching stunts. It doesn't get old because they manage to up the ante with every sequence, sometimes adding multiple levels, multiple opponents, and a fantastic, parkour style foot chase. The fights are fast and feature creative, stylized Muay Boran choreography. The first time I watched Ong Bak, I remember thinking "How did they do these stunts without people getting seriously hurt?". Well after watching several behind the scenes videos I realized that the answer is, well, some people got seriously hurt. After all, you can't flying knee a guy on a motorcycle in the head, jumping off the back of a truck, and expect everybody to be completely okay afterwards.
I can't discuss Ong Bak without discussing Tony Jaa. Jaa, who was born in Surin Province in Thailand, started his career as a stunt double for martial arts movies. He developed an interest in Muay Boran, the martial art on which the techniques of modern Muay Thai are based, and studied it for several years with the intent of making a movie that featured it heavily. That movie is Ong Bak. Jaa did all of his own stunts, without the help of wires or CGI. So yes, the really did set him on fire. This movie established Jaa as a serious movie martial artist talent, in the same discussions as Jet Li, Bruce Lee or Jackie Chan.