Blue, White, and Red.
A trilogy of movies that demonstrate the meaning of the colors of the French flag. They are funny, sad, and passionate, they are a life's work for Kieslowski, he died after finishing Red. White is easily the most palatable of the three, being the most like an American movie and the funniest in my opinion, it is a struggle of one man winning back his wife and proving that he is a man in his own right. It defines what it is to be a man and not just a guy. All three are tied in with each other and they are good as well, I just haven't seen them in years and they aren't as cemented in my memory.
http://www.imdb.com/title/tt0111507/

The Science of Sleep.
Obviously I'm into French films, but this is from one of the greatest directors of our generation, in movies and in music videos, he's easily my favorite. It's quirky like Eternal Sunshine of the Spotless Mind and Be Kind Rewind, but it exemplifies his ingenuity when it comes to in-camera trickery and still contains an odd, never perfect story line of the perfect French film.
http://www.imdb.com/title/tt0354899/

Though both of these had a decent release, I rarely hear them mentioned and think that they don't get enough play for being so fabulous.

Now for a more common couple of movies, Time Bandits and The Adventures of Baron Munchausen, I loved them as a kid and have been thinking of them lately and how great they actually were. There is something about Terry Gilliam's work that is innocent and fantastical, obviously, but I get lost in these movies and they were so real when I was little.