My favorite is Seven Samurai, by Akira Kurosawa. Its in black and white, and in Japanese, and it is an absolute classic. Its all really believable and realistic, and it's the literal inspiration for The Good The Bad and The Ugly.
One of my favorite funny movies would be the Pineapple Express. Never saw The Hangover :/ I don't have a favorite movie for everything else since I like a lot of movies, but Rambo is really good.