This is probably no fun, but I'm going steer away from the parallel existences in any type of universe (LDH has me tied up as her twin in a parallel universe, anyway -- wait until she discovers how much older that makes her
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), and try to go back to the theme of this thread.
So, like some others have mentioned, I don't know that I have
a favorite movie, but I do have favorites in various genres, and since no one seems to have mentioned Hitchcock, I'll throw him into the mix. I love
Rear Window. It's classic Hitchcock suspense (to me, his best), it stars the gorgeous and classy Grace Kelly and the always solid Jimmy Stewart, the dialogue is terrific, the chemistry between Kelly and Stewart is wonderful. I don't remember the movie score, but it's worth the watch.