Matt Damon — ‘Avatar’

Before casting Sam Worthington in 'Avatar,' James Cameron sent out an offer to his number one pick, Matt Damon. Damon turned it down, but still regrets not starring as Jake Sully in the visually ambitious flick. In a recent interview with Playboy, Damon says, "I particularly wanted to work with James Cameron, and still do. He knew he was the star of that movie and everyone was going to see it anyway. When he said, 'Look, I'm offering it to you, but if you say no, the movie doesn't need you,' I remember thinking, 'Oh God, not only do I have to say no because of scheduling, but he's going to make a star out of some guy who's going to to start taking jobs from me later.'"

Well, that last part isn't so true. 'Avatar' was more a visual feast than anything else, and we highly doubt Damon needs to worry about Worthington stealing his roles out from under him, since Worthington is clearly busy making 'Clash of the Titan's sequels for the rest of his life.