It’s A Wonderful Life (1946)
Frank Capra’s a “Christmas Carol” in reverse may be slightly heavy handed and admittedly, by the final reel, sickly sweet but it’s also probably the best christmas film of all time. Funny, heart-breaking and one of the few films ever made which has a happy ending that is guaranteed to have you reaching for the Kleenex everytime. Don’t wait until christmas to watch it.