Will Smith and Rosario Dawson

After filming ended, Will says he had a difficult time adjusting to normal life. The movie, which is about a man who suffers a serious loss, took Will to a dark, emotional place, he says.

"That re-entry period back into the family was the most difficult time after a film for me," he says. "I would come home, and my wife and kids are in the bed. ... It was just excruciating to think about what life would be without them."