There are a few movie mantras the turtle dev team carries around that serve as encouragement and inspiration as ungodly amounts of time are dumped into projects that don't currently see much light outside the perimeter of one's own enthusiasm.
Indie Game The Movie: This, and its companion, Indie Game Life After, document the struggles and joys of indie game creation. It's an inspiring and leveling tale about the work and life impact behind indie hits: Super Meatboy, Braid, and Fez. It's a relevant narrative for the art and culture of games, and the struggles under the hood of any indie effort. A must for anyone testing the waters of game development.
American Movie: They wouldn't have made a documentary about him if he was normal. Against all odds of child support, money, family and himself, Mark Borchardt (and his cast of amazing friends and family) pulls off the impossible and makes a movie. There is overwhelming heart, friendship, and insanity in the gonzo of Mark's creative process.
Ed Wood: A Tim Burton movie that canonized its namesake as the patron saint of interstellar angora. Again, a story about a person who rendezvoused passions on the fuzzy side of the tracks.