The "Bourne" movies were huge moneymakers for Matt Damon. But when Matt director Paul Greengrass, with whom he made the first three movies, decided not to return for the fourth film, Matt walked away from the franchise as well, out of loyalty to his friend. "When he wants to do one, we'll do it," Matt said while promoting "Invictus" in 2009. "I've always said that." Bad news for Matt, but good news for Jeremy Renner!