Christian Bale uses his weight to get into roles so often that we might start thinking that's his true talent instead of the whole acting thing — but then we remember he's Christian Bale and that he's SUPER RAD at acting and we stop questioning him!
Seriously though, if you talk about tailoring weight to roles, Christian is the first actor to pop in your head! He lost SIXTY pounds for the Machinist, got ripped for Batman, then dropped it all again for the Fighter.
For American Hustle he GAINED 43 pounds! And here's how he did it: