Pulling off a great movie usually sounds like a long, expensive process, which is why these titles feel even more impressive. Some of them became classics, some won major awards, and all of them proved that a tight shooting schedule does not have to show on screen. In fact, part of the thrill is knowing just how little time these filmmakers had to get everything right. These are 15 great movies that were filmed in less than a month and still ended up leaving a huge mark.