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

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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.

Because real-life artist Christy Brown could only control his left foot, Daniel also learned how to paint using a knife that he held between his toes.

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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.

He told Kevin Hart, “Just bringing it up, I start to get teary. I wanted to feel the degradation of slavery, and I went too far in. That level of human brutality… I had the chains on my neck and we were working. I wanted the real weight of them. I wanted real chains. They put it on my neck and they were fitting it for size and the prop master went to put the key in and it didn’t work.”

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

However, in real life, Leo is strictly a vegetarian.

Getty Images / 20th Century Fox / Everett Collection

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

When asked why he didn't just fake it for the camera Robert shared,

When asked why he didn't just fake it for the camera Robert shared, "[It} just doesn’t work, so I pleasured myself in front of the camera."

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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

She said, "This wasn't a game we were playing called 'Let's try to make Charlize look ugly.' I didn't want it to look like a caricature. I just wanted it to look like Aileen."

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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.

He also learned how to speak Swahili and primarily ate mashed bananas and beans.

Getty Images / Fox Searchlight / Everett Collection

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

She said, “When you’re a kid, you’re fearless, but starting at 26 years old, I had a lot of fear.”

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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.

He said, "I abandon my life when I work. I don't wear the clothes or listen to the music that defines who I am. I don't communicate with friends or family. It sounds intense, but it's the process of getting there that is really hard."

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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.

"I soaked up everything, I watched every interview that I could," she said. "I slept in her bed at home. I talked to the whole family. I spent time with them. It can be melancholy and beautiful at the same time."

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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

Gary even went on to say, “You can’t have Winston Churchill without a cigar.”

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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

Fans and even bandmates mistook Val for the real Jim Morrison on numerous occasions and some even have tattoos of him. He said, "It still boggles me to this day to see people with a tattoo of me playing him and not knowing it isn't Jim. Happens more than you think.”

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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