Groundhog Day (1993)
Karma. It's a bitch. For Phil Connors more than for most people. Bill Murray plays the utterly unpleasant weatherman who must relive the worst day of his life over and over again, until he gets it right.
This movie is in tight competition with Ghostbusters for being the best thing Harold Ramis and Bill Murray have ever been involved in. The film derives most of its humor from Murray's perfect dry delivery of his pompous lines ("ALL the long distance lines are down? What about the satellites? Is it snowing in space?"), and those signature repetitious scenes, but what makes this one of the best comedies ever written is the deeper story. The story about redemption, self-sacrifice, and - to put it less eloquently - the story about not being a jerk. Oh, and finding true love as well.
Watch it, re-watch it, and watch it again. Laugh until you puke, but never forget the phrase "it's funny, 'cause it's true". It was never applied more appropriate to anything than to this film. Bing!
Never forget to love it. Again and again.