It's a Wonderful Life

If you've ever wondered if the world might not have been better off if you had never been born (Yes, all you "Bohemian Rhapsody" junkies from the 70s), then you'll definitely be able to relate to this movie, and you won't even mind that it's not in color. It's doubtful that a better version could ever be made.

You'll even want to watch it a few times, just to make sure the lesson sticks.