If you only see one movie this Valentine's Day weekend, you must see Ong-Bak: Muay Thai Warrior.
This incredible film from Thailand is an exhilarating chase / stunt / fight movie about a poor kid from a remote village who must travel to Bangkok to recover a stolen Buddha's head. Imagine a pre-Hollywood Jackie Chan film crossed with a less-violent version of Bloodsport and you'll have some idea of what this movie is about. I won't go into details (read the summary on IMDB), but suffice it to say this was the first time in a long time where I went to a movie and the entire theatre was laughing and cringing and clapping throughout the whole movie.
It's truly impressive stuff.