For some actors, just looking the part isn't always enough. Here are several who took method acting to the extreme.
1. Adrien Brody // The Pianist (2002)
Brody dropped 30 pounds in order to portray Holocaust survivor Wladyslaw Szpilman in The Pianist, and actually learned to play piano, practicing four hours a day. After that, most actors would have called it a day. Instead, Brody decided he needed to feel as lost as Szpilman did after he was forced out of the life he knew: "I gave up my apartment, I sold my car, I disconnected the phones, and I left," Brody told the BBC. "I took two bags and my keyboard and moved to Europe." (Not surprisingly, his frustrated girlfriend at the time dumped him.) His sacrifices paid off in the form of a 2003 Oscar for Best Actor.
2. The cast of One Flew Over the Cuckoo's Nest (1975)
The cast of the Best Picture-winning film, including Jack Nicholson, lived at the psychiatric ward where the movie was shot, interacting with real patients and undergoing group therapy sessions—some of which director Milos Forman filmed without their knowledge.
3. Sylvester Stallone // Rocky IV (1985)
While filming Rocky IV, Stallone asked co-star Dolph Lundgren—a.k.a. Ivan Drago—to try and "really" knock him out. "Bad idea," Stallone later recalled. "Later that night my blood pressure goes up to 260, I go to the hospital, they put me in an emergency jet, and fly me back to America. Next thing I know I’m in intensive care for five days with nuns walking around. He hit my heart so hard that it banged against my ribs and started to swell, and that usually happens in car accidents. So I was hit by a truck!”
4. Christian Bale // The Machinist (2004)
The six-foot-tall Bale famously dropped 60 pounds to play a severe insomniac in this psychological thriller—and, within six weeks, gained it all back for his role in Batman Begins. His Machinist co-star Michael Ironside has suggested that Bale might not have gone to such extreme lengths had screenwriter Scott Kosar taken the time to alter his script. "The writer is only about five-foot-six, and he put his own weights in," Ironside said. "And then Chris did the film and Chris said, ‘No, don’t change the weights. I want to see if I make them.’ ... So those weights he writes on the bathroom wall in the film are his actual weights in the film."
5. Billy Bob Thornton // Sling Blade (1996)
Thornton depended on an unusual—and painful—method to nail his character Karl's signature shuffle: The actor placed crushed glass inside his shoes, forcing him to limp around. He earned an Oscar nomination for the role.
6. Val Kilmer // The Doors (1991)
To score the part of Jim Morrison in Oliver Stone's The Doors, Kilmer spent thousands of dollars producing an eight-minute music video of him singing the rocker's songs. Once he booked the gig, Kilmer memorized 50 Doors songs, and even (allegedly) wore Morrison's clothes and frequented his favorite Hollywood hangouts. The actor also spent hundreds of hours interrogating Paul Rothchild, a producer for the iconic rock band and a consultant on the film. At the end of production, Rothchild said that Kilmer "knows Jim Morrison better than Jim ever knew himself. He's nailed—to the extent that The Doors themselves had difficulty telling whether it was Val singing or Jim singing. Early on, I'd bring them into a recording studio and I randomly switched Val and Jim and they guessed wrong 80 percent of the time.''
7. Nicolas Cage // Birdy (1984)
In order to physically feel the pain his Vietnam vet character might have, Cage had a few teeth pulled—without anesthesia. He also spent five weeks with his face wrapped in bandages. "The reactions on the street were brutal," Cage told The Telegraph. "Men and women laughing, kids staring. And when I took the bandages off, my skin was all infected because of acne and ingrowing hairs."
8. Robert De Niro // Taxi Driver (1976)
De Niro actually got his cab driver's license while prepping for his role in the Martin Scorsese classic. The Oscar winner worked 12-hour shifts, and would reportedly pick up passengers around New York City during breaks from shooting.
9. Halle Berry // Jungle Fever (1991)
Berry was set on getting inside the head of the drug addict she played in Spike Lee's 1991 film. The actress visited a crack den as part of her research, and didn't bathe for two weeks. ''It's true,'' she told Wendy Williams in 2012. ''Ask Sam Jackson! He had to get a whiff of it.''
10. Jamie Dornan // The Fall (2013)
Dornan, who plays a serial killer on the chilling Netflix series, wanted to experience the thrill of the chase. So, "On the tube … I, like, followed a woman off the train one day to see what it felt like to pursue someone like that," Dornan has said. Keeping his distance, the actor followed her for several blocks.
11. & 12. Shia LaBeouf //The Necessary Death of Charlie Countryman (2013) & Fury (2014)
When LaBeouf heard that his Charlie Countryman character dropped acid during a scene, he wanted to make his big-screen portrayal of the act as realistic as possible. In order to prep, LaBeouf took LSD, filmed his trip, and sent the video off to co-star Evan Rachel Wood for feedback.
The day after he got his role as a WWII soldier in Fury, "I joined the U.S. National Guard," LaBeouf told Dazed magazine. "I was baptized—accepted Christ in my heart—tattooed my surrender and became a chaplain’s assistant to Captain Yates for the 41st infantry. I spent a month living on a forward operating base. Then I linked up with my cast and went to Fort Irwin. I pulled my tooth out, knifed my face up, and spent days watching horses die. I didn’t bathe for four months.”
13., 14. & 15. Daniel Day-Lewis // The Crucible (1996), Gangs of New York (2002) & Lincoln (2012)
For his role in The Crucible, Day-Lewis committed to living on the set, which was a replica of a colonial village—meaning there was no electricity or running water. He also built his own 17th-century house, using only the tools America's settlers would have had available to them at the time.
The three-time Oscar-winner's devotion to his craft nearly cost him his health on Scorsese's Gangs of New York, when Day-Lewis refused to wear a modern-day winter coat on set during filming and caught pneumonia. (To portray Bill the Butcher, he also flew in a British butcher to teach him how to cut up carcasses. No big deal.)
For Lincoln, he refused to break character—period. Day-Lewis walked, talked, and even texted as Honest Abe, according to his co-star Sally Field. "I never met him. Never. I met him as Mr. Lincoln. He met me as Molly, as he called her," Field said. "After I got the role, there were seven months before we began to shoot and he would text me all the time, in character. I would have to then answer back in the language of the time, which was really hard to figure out, but great fun."