Ashton Kutcher – Jobs
Ashton Kutcher was determined to get it right for his big role as Steve Jobs in the film “Jobs.” The actor tried to copy the notorious tech lord in every way he could, starting with his actual diet. Apparently, that meant a diet made up solely of fruit. Unfortunately, Kutcher’s body had a harder time with that than Jobs did, as the actor ended up in the hospital due to severe vitamin deficiency and reduction in bone density
Thankful, the “That ’70s Show” actor recovered and returned to production. To put yourself through such medical distress for a role really shows how badly the actor wanted to make it successful. In the end, he didn’t do a bad job, Jobs!
Natalie Portman – Black Swan
Actress Natalie Portman pushed herself right to the edge when it came to the film "Black Swan." Not only did she explore the psychical state of a mentally disturbed ballet dancer, but she also transformed herself physically too. The actress lost 20 pounds for the role making her pretty dangerously thin. While she did have a double, she did practice ballet with a number of dance instructors in a very demanding program.
The actress claims to not belong to the method school of acting and does not use past experiences when channeling certain emotions during her acting but that doesn't mean she didn't go through a lot for this role. Portraying a disturbed ballerina is no walk in the park.
Shia LaBeouf – Fury
Shia LaBeouf didn't want to just rely on makeup artists to make his wounds look real. He took it a step further and actually decided to cut up his cheek and leave the sore open for the entirety of the production. It didn't stop there. The actor then proceeded to pull out a tooth to amp up the pain.
Of course, when you're portraying a dirty soldier, hygiene isn't a priority, which is why the actor also didn't bathe for a whole month. The rest of the crew and actors had a real hard time working with that smell and pleaded with the actor to go to a different room in between shoots. That's commitment right there!
Robert De Niro – Taxi Driver and Raging Bull
This legendary actor is not afraid of a challenge, so it's really not surprising to see what he did for some of his films. Even though it's not out of character, his work on "Taxi Driver" really stood out. The actor got himself a fake and illegal taxi license so that he could drive people around New York and get some inspiration.
He also practiced boxing with real-life Jake Lamotta for"Raging Bull", making his boxing skill look super authentic. The actor even at one point broke the guy's ribs and knocked out his teeth. Yikes.
Johnny Depp – Fear and Loathing in Las Vegas
Hunter Thompson's Fear and Loathing in Las Vegas gave Johnny Depp a real opportunity to show off his acting chops. To get as close as he could to the real-life version he went for some interesting choices, one of which involved sleeping next to explosives. Just like Thompson would do.
The actor also took some hardcore substances during shooting and according to insiders even shows up to the audition in Thompossons clothes that had not been washed for thirty years. The directors obviously really appreciated that.