Demi Moore – GI Jane
When the gorgeous actress Demi Moore played the tough Jordon O’Neil in “GI Jane” the first thing she has to do was shave all of her hair off. Then came the exhausting training led by former Navy SEALS.
According to Moore, she claimed that she could have let a stuntwoman come and take over the more physical roles but she decided to them herself feeling that she would have missed out on an opportunity.
Chris Hemsworth – In the Heart of the Sea
Chris Hemsworth put himself through the wringer for the epic film "In the Heart of the Sea." The Australian actor completely transformed himself by putting himself on a strict diet with an intake of no more than 500 calories a day.
The Ron Howard film showed a scarily emaciated and disheveled Hemsworth. According to Entertainment Weekly, the actor said, that he and the actors were obsessively weighing themselves every day.
Charlize Theron – Monster
When Charlize Theron was given the challenge of playing Aileen Wuornos in the 2003 film, Monster, she was in for quite a trip. Not only did she transform physically to the point that you couldn't even recognize her. Her skin was layered with a tattoo sink, her hair was thinned and she had dentures put in.
The beautiful actress even shaved her eyebrows. Of course, there was also the emotional distress of playing such a disturbed and tragic individual.
Rooney Mara – The Girl with the Dragon Tattoo
Rooney Mara worked extensively with director David Fincher and Pat McGrath the renowned makeup artist to create the 26 different looks that made up the character Lisbeth Salander. In addition to the jet black hair and piercings, Mara also got her eyebrows bleached.
Mara felt like the piercings and the tattoos she got for the role were just the right choice.
Danny DeVito – One Flew Over The Cuckoo’s Nest
We are sure that everyone had a tough time portraying psychiatric patients in the iconic film "One Flew Over The Cuckoo’s Nest", but Danny Devito had a particularly troubling time on set. The actor even created an imaginary friend for himself.
The production was shot in an actual mental asylum and many of the actors suffered mental breakdowns throughout filming.