Christian Bale: Batman
Crazy fact: The typically 185-pound Christian Bale shed 63 pounds from his 6-foot frame to play a traumatized man in the dark 2004 film The Machinist. He then regained that weight — plus an extra 40 pounds (!) — in the short span of five months to play billionaire playboy/Gotham savior Bruce Wayne in Christopher Nolan’s Batman Begins.
Of his wild physical transformation, Christian admitted to IGN, "You do get a lot of nervous energy, I think, putting weight on. Unfortunately, I had to put it on pretty fast and it's not very healthy doing that. That was when I felt bad. I did actually start to feel I was putting my body under too much pressure, because I put on 100 pounds in five months. You get big mood swings, but not such a bad thing when you're playing this darker version of Batman."