There’s no doubt about it: most celebrities who work in Hollywood lead very glamorous lives. They are driven around town in limos and spend their days being pampered, enjoying fine dining, and wearing the most expensive clothes.

However, there’s another side to being famous. Some actors are known for their serious preparation for the roles they undertake, and very often it’s anything but glamorous. In fact, in some cases, it’s the total opposite.

These 10 actors worked ridiculously hard to make the best movies possible. What did they get in return other than a massive paycheck? They got permanent scars of the emotional and physical variety…

1. The Shining is considered to be one of the greatest horror movies of all time. Shelley Duvall played the role of trapped wife, Wendy Torrance, in the film. The terror she showed wasn’t acting at all, however. Director Stanley Kubrick worked her for hundreds of hours to get the end result he desired. The movie was a masterpiece, but Shelley swore never to work with Kubrick again.

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2. There’s a reason why the skeletons in Poltergeist look so real. During the infamous scene where JoBeth Williams swam with dead bodies, she was, in fact, in the water with real human remains. She reported coming home after filming to find all of the pictures on her wall to be crooked.

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3. Offscreen, Leonardo DiCaprio is a known connoisseur of yachting and courting women under the age of 25. However, he tossed such comforts to the wind during the filming of The Revenant, during which he crawled inside real animal carcasses and ate raw bison liver.

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4. The infamous shower stabbing scene in Psycho didn’t just haunt the people who watched it. Janet Leigh, who played victim Marion Crane, reportedly refused to shower after the shoot. She didn’t let hygiene go by the wayside, though; instead, she opted for baths.

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5. In The Conjuring, Patrick Wilson plays a ghost hunter inspired by a real-life investigator named Ed Warren. Before the film, Wilson wasn’t a believer in the supernatural. However, once they began filming, he and his family started to hear the haunting laughter of children in his house at night. He’s surely a believer now!

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6. Roman Polanski wasn’t afraid to push Mia Farrow during the filming of Rosemary’s Baby. In one scene, he had her eat raw liver take after take after take. The worst part? Mia was a very serious vegetarian. All in a day’s traumatizing work, huh?

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7. If you have ever watched Alfred Hitchcock’s movie The Birds and thought that actress Tippi Hendren gives a brilliant performance, that’s because it wasn’t a performance at all! During the final scenes, Hitchcock threw dozens of live birds at Hendren to get a more authentic performance. Needless to say, it worked.

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8. Patrick Wilson wasn’t the only one of the set of The Conjuring to experience something supernatural. Actress Vera Farmiga reported seeing three digital claw marks down the front of her laptop after accepting the role. It didn’t stop there, either. When they were done shooting, she noticed more claw marks on her legs. Eek!

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9. For Adrien Brody, it was essential during the shooting of the film The Pianist that he feel he had lost everything—just like his character. So he sold his house, sold his car, turned off his phone, starved himself, and broke up with his girlfriend. He won an Oscar, but he also became deeply depressed.

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10. To lose weight for her role as Fantine in Les Miserables, Anne Hathaway only ate dried oatmeal paste. This caused her to feel exceptionally frail both physically and emotionally. She reported having a hard time reconnecting with reality once the shoot was over.

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Wow, these actors really pushed themselves to extremes and experienced some intense moments both on-set and off! They will never forget shooting these roles.

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