Celebrated actor Daniel Day-Lewis announced his retirement from acting, much to the chagrin of his many fans. The reclusive actor is known for his many feats of method acting, but he isn’t the first actor, nor the last, to tackle this technique. Before diving in, let’s do a little refresher about what exactly method acting is.

Method acting is simply the technique used by actors to immerse themselves into their characters. Day-Lewis has famously perfected this technique for nearly all of his roles, and has occasionally gone a little too far. He isn’t the only one, though. This article points the spotlight at the many actors who, in various stages of their careers, decided to give the technique a try.

Most of these actors have been rewarded greatly for their enthusiasm and struggles– a commonality among most is extreme weight loss, and others have been scrutinized, or worse, and ended up with not as much screen time.

Let’s take a look at these 15 Actors Who Took Method Acting WAY Too Far.

15. Jared Leto -- Suicide Squad

Jared Leto as Joker in the Suicide Squad Extended Cut

Jared Leto’s Suicide Squad are well known to many fans, but, nevertheless, they still deserve attention. As it turns out Leto, who was playing the latest iteration of the Joker, didn’t actually send used condoms to the cast of the DC Extended Universe film.

Director David Ayer said of the incident, “let's be real here. They're (the condoms) removed from their packages, but it wasn't actually used.” Leto also sent the cast a dead hog and he gave a special gift to Margot Robbie: a live rat in a box.

For all of his antics on set, Leto’s Joker only received about 10 minutes of screen time in Suicide Squad and the rest ended up on the cutting room floor. However, many fans hope that they'll see more of him in movies.

14. Shia LaBeouf -- Nymphomaniac

Did former-Disney kid Shia LaBeouf know what or how to method act when he was a child actor? Probably not. Who knows when his interest in performance art and baring it all for the camera (pun intended) happened, but both certainly helped him in his role for Nymphomaniac.

The Lars von Tier production required porn doubles and prosthetic genitals, but LaBeouf insisted on doing it for real. “I know I'm the only actor who doesn't have a stunt double, and I know it's something that I needed,” explained LaBeouf. His co-star, Stacy Martin, told Vice that prosthetics were used for all of her scenes.

Whether or not he performed the scene with his co-star, Stacy Martin, or with one of the porn doubles remains to be seen. Or not seen, because who really wants to see Louis Stevens in such compromising situations?

13. Jamie Foxx -- Ray

Jamie Foxx as Ray Charles in Ray

"Imagine having your eyes glued shut for 14 hours a day," said Jamie Foxx about his role as celebrated musician Ray Charles in the film Ray. Foxx was 36 years old when he took on one of his biggest roles to date.

Prior to Ray, his career mostly consisted of lesser-known movies such as Booty Call and his successful TV show The Jamie Foxx Show, but in the biographical film he proved his acting worth. Along with gluing his eyes shut, Foxx lost close to 30 pounds to portray Ray, who had a brief bout with heroin addiction. Foxx also asked a cosmetic dentist to chip his front teeth, as he thought his teeth looked unconvincing for the role.

Like most of the other actors on this list, Foxx was nominated for and won an Oscar for Best Actor for his talented performance. That same year he was also nominated for Best ing Actor for playing a dorky cab driver in Collateral, although the role required much less method acting.

12. Marlon Brando -- The Men

Marlon Brando in The Men

Marlon Brando got his start in theater– the birthplace of method acting. Brando had been in six Broadway plays before he landed the role of Kenneth in the 1950 film The Men.

The movie took place in a military hospital, where Brando’s portrayed a paraplegic former soldier who comes to with his predicament. In his role for A Streetcar Named Desire, Brando first showcased his method acting, which enabled him to act more naturally than his co-star Vivien Leigh.

In The Men Brando did much of his preparation before filming even started. He spent a month in a hospital bed at Birmingham Army hospital, where he studied the patients of the hospital. He learned to rely on upper-body strength the same way many of them did.

Brando was able to bring theater into movies and, as a result, redefined acting.

11. Choi Min-sik -- Oldboy

Choi Min-sik's method acting is extremely impressive. In Oldboy, Choi portrays Oh Dae-Su, a man who was imprisoned in a hotel for 15 years and then, upon his release, seeks out his tormentors.

Before his eventual release Dae-Su uses a hot wire to burn the years of confinement onto his flesh. Choi didn’t think special effects would suffice, so he decided to actually burn himself. Once Dae-Su is released he hungrily eats a live octopus. Although he is a vegetarian, Choi decided that the role needed to look as realistic as possible, and consumed several live octopuses for the scene.

The 2003 film, as well as Choi’s performance, had become a cult-classic by the time a Spike Lee made a U.S. version of Oldboy. The 2013 remake of the same name has been regarded as a watered-down photocopy, and its star, Josh Brolin, didn’t even offer to burn his own skin.

10. Hilary Swank -- Boys Don't Cry

Hilary Swank Boys Don't Cry

Method acting involves actors getting into the headspace of their character. However, Hollywood has had a longstanding tumultuous relationship with transgender characters. Either played for laughs or for scares, a well-rounded transgender character was hard to come by until the 1999 film Boys Don’t Cry.

When Hilary Swank landed the role to portray the real-life transgender woman Brandon Teena, she had only a few television and theatrical credits. Boys Don’t Cry was about Teena's life, which was tragically cut short as the result of a hate crime.

Once the movie came around, Swank threw herself into the role, and lived as a man for a month before shooting. Swank bound her breasts, lost weight, and assumed masculine characteristics.

"If you don’t fit into a black-or-white definition of boy or girl you slip between the cracks and it’s a lonely place," said Swank about her preparation for the role. The harrowing story and Swank’s portrayal led her to win an Academy Award at just 25 years old.

9. Jim Carrey -- Man on the Moon

Jim Carey in front of a curtain in Man On The Moon

Jim Carrey’s role as eccentric entertainer Andy Kaufman in Man on the Moon was only his second dramatic role in his-- at that point-- nearly 20 year career. Carrey had made his mark in Hollywood by portraying comedic characters, so, unsurprisingly, he put everything into the role of Kaufman in the biopic.

Carrey famously stayed in character throughout filming, and was insistent on experience everything Kaufman did. Former wrestler Jerry Lawler was asked to play himself for scenes that recreated his feud with Kaufman. For insurance reasons Lawler couldn’t, and wouldn’t, recreate the wrestling move that put the real Kaufman in the hospital for several days, but Carrey was persistent.

After spitting in Lawler’s face, Carrey got what he wanted when Lawler finally let loose, and Carrey earned a Golden Globe for his portrayal of Kaufman.

8. Aaron Eckhart -- Rabbit Hole

Using grief to benefit your role is a tried and true practice for a lot of actors, but faking grief is an entirely other story.

During an appearance on The Howard Stern Show, Aaron Eckhart itted to attending a grief group to prepare for his role in Rabbit Hole. Eckhart, who doesn’t have children, itted that his presence there was rude, and he even went so far as to tell a fake story about the loss of his own child in front of couples who had actually went through such a traumatic experience.

"You really believe that you just lost a child. You are as close to reality in that sense as possible,” said Eckhart. If this wasn't bad enough, he even confessed to breaking down in front of the actually grieving parents.

Not surprisingly Eckhart wasn't nominated for his role in Rabbit Hole.

7. Jamie Dornan -- The Fall

Jamie Dornan as Paul Spector in The Fall

It wasn’t Jamie Dornan’s role as Sheriff Graham Humbert on Once Upon A Time that provided him with a wealth of knowledge about playing a psychopath serial killer. However, it is interesting that he chose to follow this up with the role of prime suspect Paul Spector on the BBC Two thriller The Fall.

Before going toe-to-toe with Gillian Anderson’s Detective Stella Gibson, Dornan itted to actually following a woman. About the unorthodox move Dornan said that “it felt kind of exciting, in a really sort of dirty way.”

50 Shades of Grey. Only one of those characters earned him a BAFTA nomination, and it obviously wasn’t the one that had a red room of pain.

6. Chloe Sevigny -- Brown Bunny

Years after Chloe Sevigny’s controversial performance in The Brown Bunny, she still gets asked about its infamous scene. “It happened,” she said at the 2016 Cannes Film Festival, and she doesn’t regret it. Her real-life oral sex scene in the 2003 film has been scrutinized ever since because of its shocking nature.

A popular rumor after the release of the film was that she was dropped from her U.S. agency because of her role as Daisy, the ex-lover of the film’s protagonist. The rumor proved to be false, however, and it turns out that it was just differences with the agency and coincidental timing that lead to her departure after the movie’s release.

While Sevigny has received the majority of the criticism from the media for one of the most shocking performances ever filmed, her co-star Vincent Gallo has remained mostly unscathed by the controversy.