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Thanks for making the post - great idea.
I guess it would have to be movies that rely more on the plot/dialogues/conversations than on the action (probably should add Mission Impossible here).
I think movies help us to understand how people usually speak, but I doubt movies will help us in improving verbal score. Movies can be considered as a vocabulary aid.
If we compare two hours (on average) spent enjoying a book or a movie, reading a book surely would help towards GMAT preparation. You have to maintain your concentration level for two hours in order to grasp ideas from a book.
I agree that we need to relax a couple of times while we prepare for exams.
Some movies really do have a rich vocabulary. I would recommend these:
1) Pulp Fiction (Normal everyday and hilarious conversations, wonderful screenplay, sudden "adrenaline-rush" moments)
2) Shawshank Redemption (Dialogues, philosophical, slow, surprising in the end)
3) Fight Club (Philosophical, many dialogues are beautifully scripted, mind f*** in the end)
4) Into The Wild (Industriousness, frugality, Human Relations)
5) Sherlock Holmes (Comic, suspenseful, very rich in English vocab)
6) Stranger Than Fiction (Hilarious Comedy, wonderful English)
7) Sin City (Dark, literally!)
8) Inglorious Basterds (Many interesting dialogues)