Actor Matt Damon says an injury and a 30-pound weight gain kept George Clooney from having much fun while making their new film, "Syriana."

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Clooney packed on 30 pounds to play a CIA operative in the political thriller in theaters Wednesday.

"He had put on all that weight and he was really depressed," Damon told reporters in New York recently. "George is a really active guy and he couldn't move around. He had to just sit there. I've never seen him like that. He's normally the life of the party, but he was really depressed.

"He also had his neck problem and that was during the filming of this, in that torture scene where he fractured his neck or whatever, so he was kind of immobile and a little angry," Damon continued. "But coming out of it, he literally wrote and directed and edited 'Good Night, And Good Luck,' because he had so much drive coming off that experience because he was made to sit still for four months."

Clooney has since lost the weight he gained for the role and recovered from his neck injury.