* DyeingForYourArt: To play Fantine in ''Film/LesMiserables2012''. She had her hair cut (on camera) extremely close to her scalp, telling her hairdresser (who played the barber on-screen) that if he cut her scalp, and she started to bleed, to keep going. (The idea of which freaked Creator/HughJackman out.) More alarmingly, she lost a ''lot'' of weight in a very short amount of time -- if Bazaar magazine is to be believed, fourteen pounds in fifteen days for one stretch of it. She doesn't talk much about her diet or her methods, as the point of the exercise was to make herself look like she was dying, and she refuses to glamorize her character starving to death.
* OldShame: [[AcademyAwardsCeremonies Her 2011 Oscar hosting]]. She says it resulted from not getting honest feedback from her friends and not watching the taped rehearsals. She later warned Creator/SethMacFarlane to not repeat her mistakes for the 2013 show.