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Robert Pattinson Masturbated To Completion On Set, And 17 More Wild Things Celebrities Did For Their Movie Roles

Leonardo DiCaprio slept inside an animal carcass but at least he won an Oscar out of it.

1. Daniel Day-Lewis refused to get out of his wheelchair while he filmed My Left Foot and damaged two ribs because of it — he insisted that the crew spoon-feed him.

Daniel Day-Lewis on the red carpet and Daniel in a wheelchair in the movie My Left Foot.

2. Hilary Swank tried to "pass as a boy" by cutting her hair, binding her breasts, speaking in a lower register, and putting socks down the front of her pants while she prepared to play trans man Brandon Teena in Boys Don't Cry.

Hilary Swank on the red carpet and Hilary playing Brandon Teena in Boys Don't Cry

3. Lady Gaga "lived" as Patrizia Reggiani for a "year and a half" and only spoke in an Italian accent for nine of those months while filming House of Gucci.

Lady Gaga on the red carpet and Lady Gaga playing Patrizia in House of Gucci

4. Will Smith admitted he "went too far" while working on Emancipation and he got stuck in literal chains. He said he "wanted to feel the degradation of slavery," but was on the "hyperventilating edge" when the prop master lost the key to the chains.

5. Jamie Foxx wore prosthetic eyelids so his eyes would be glued shut for 14 hours on filming days while he played Ray Charles in the movie Ray.

Jamie Foxx on the red carpet and Jamie with sunglasses on playing the piano in the movie Ray

6. Leonardo DiCaprio slept inside of an animal carcass, ate raw bison meat, and was on the brink of hypothermia all while playing Hugh Glass in The Revenant.

Leonardo DiCaprio on the red carpet and Leo playing Hugh Glass in The Revenant

7. Robert Pattinson masturbated on set to completion while portraying Salvador Dalí in Little Ashes.

8. Ashton Kutcher gave himself pancreatitis and was hospitalized twice (!!!!) while preparing to play Steve Jobs in Jobs.

Ashton on the red carpet and Ashton posing in front of a computer dressed as Steve Jobs

9. Charlize Theron wore dentures, shaved off her eyebrows, had her hair thinned out and fried repeatedly, and gained 30 pounds to play serial killer Aileen Wuornos in Monster.

Charlize Theron on the red carpet and Charlize as Aileen Wuornos holding a bottle of beer

10. Forest Whitaker stayed in character while playing Ugandan dictator Idi Amin in The Last King of Scotland even off set — it was so intense his family stopped speaking to him.

Forest Whitaker on the red carpet and Forest yelling into a microphone as Idi Amin.

11. Margot Robbie trained in ice skating for five hours a day, five days a week, for five months to play Tonya Harding in I, Tonya — she worked herself so hard she got a herniated disk in her neck.

Margot Robbie on the red carpet and Margot crying about her skates dressed as Tonya Harding

12. Joaquin Phoenix totally abandoned his own sense of self, refused to talk to his family, and only lived as Johnny Cash for the entirety of filming Walk the Line.

Joaquin Phoenix on the red carpet and Joaquin singing as Johnny Cash in Walk the Line.

13. Jennifer Lopez slept in Selena Quintanilla's bed while she prepared to portray the singer in Selena.

Jennifer Lopez on the red carpet and J.Lo singing into a mic as Selena.

14. Adrien Brody gave up his apartment, sold his car, disconnected his phones, and lost 30 pounds on a crash diet in order to play Wladyslaw Szpilman in The Pianist.

Adrien Brody on the red carpet and Adrian playing the piano in The Pianist

15. Gary Oldman gave himself nicotine poisoning after smoking $20,000 worth of Winston Churchill's favorite cigars for Darkest Hour.

Gary Oldman on the red carpet and Gary with a cigar in his mouth as Winston Churchill

16. Colin Firth developed headaches, a pinched nerve in his arm, and a stutter of his own after portraying George VI in The King's Speech.

Colin Firth on the red carpet and him as King George VI in The King's Speech.

17. Val Kilmer got so immersed in playing Jim Morrison in The Doors that he needed to get therapy just so he could come out of character.

Val Kilmer on the red carpet and Val singing as Jim Morrison

18. And finally, Christian Bale got a $3,000 neck exercise machine so he could thicken his neck to look like Dick Cheney's for Vice.

Christian Bale on the red carpet and Christian as Dick Cheney