Jared Leto (Chapter 27)
In order to play John Lennon’s assassin, Mark David Chapman, Leto gained 67 pounds, leaving him unable to walk to set. The actor told the Los Angeles Times, “The script didn’t say, ‘Page 1: You gain 67 pounds, and you’re miserable for two months.’ But as I started to research, I realized that the physical representation of this guy had so much to do with who he was.”