Defendor!
Wasn't sure I'd ever see a serious comic parody. Defendor does a great job, though. It takes the realism of Watchmen and Batman (people without powers but a strong sense of justice) and combines them with the delusions of Don Quixote. If you're a fan of comic book heroes with a sense of humor, watch this movie. Or if you're just a fan of satire in general, you'd probably like it too.