Pakistan, Nov. 7 -- Matt Damon could have been the man sharing his life with a foul-mouthed teddy bear in Ted. Instead, one case of overthinking cost him a role in a comedy that went on to become a massive hit.

The actor opened up about turning down the 2012 film in his GQ Men of the Year cover story, admitting he was completely sold on the script at first.

In fact, he laughed so hard while reading it that he took it to dinner and read parts aloud to his friends.

But then he started second-guessing himself.

"I've never had this experience where I laughed so hard reading a script," Damon, 56, said.

"And then I just got too clever by half. I don't know what I was thinking," he added. "I was like, 'Well, maybe the teddy bear's actually ...