Matt Damon says he 'fell into depression' while filming one of his movies.
The Hollywood star is currently doing the media circuit ahead of the release of the long-awaited Christopher Nolan epic Oppenheimer.
And during one of his interviews, the 52-year-old revealed that while he's enjoyed an incredibly successful career, not all of his films have been a hit.
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Damon explained that one movie in particular was incredibly hard to shoot, and really took its toll.
Speaking to Jake's Takes, the Good Will Hunting star said: "Without naming any particular movies... sometimes you find yourself in a movie that, you know, perhaps might not be what you had hoped it would be, and you're still making it.
"And I remember halfway through production and you've still got months to go and you've taken your family somewhere, you know, and you've inconvenienced them, and I remember my wife pulling me up because I was I fell into a depression about like, what have I done?
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"And she just said, 'We're here now', you know, and it was like... I do pride myself, in a large part because of her, at being a professional actor and what being a professional actor means is you go and you do the 15-hour day and give it absolutely everything, even in what you know is going to be, you know, a losing effort.
"And if you can do that with with the best possible attitude, then you're a pro, and she really helped me with that."
But while he preferred, for obvious reasons, to leave the name of the film out of it, I think it's safe to say that he wasn't talking about his latest release.
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Oppenheimer, which is set to land in cinemas on 21 July, is a biographical drama following J. Robert Oppenheimer and the creation of the atomic bomb during WWII.
The movie sees Damon star alongside some of the biggest names in film, such as Peaky Blinders' Cillian Murphy, who plays the theoretical physicist, as well as Robert Downey Jr. and Emily Blunt.
And it promises to be a nuclear hit after Nolan, 52, opened up on the challenges of showing an atomic explosion without resorting to computer-generated imagery (CGI).
In an interview with Games Radar's Total Film, he said: "I think recreating the Trinity test [the first nuclear weapon detonation, in New Mexico] without the use of computer graphics, was a huge challenge to take on.
"It’s a story of immense scope and scale. And one of the most challenging projects I’ve ever taken on in terms of the scale of it, and in terms of encountering the breadth of Oppenheimer’s story."
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Ahead of its release, Nolan said people have been walking out of the screenings feeling absolutely 'devastated'.
"Some people leave the movie absolutely devastated," he told Wired. "They can’t speak. I mean, there’s an element of fear that’s there in the history and there in the underpinnings.
"But the love of the characters, the love of the relationships, is as strong as I’ve ever done."
He added: "It is an intense experience, because it’s an intense story. I showed it to a filmmaker recently who said it’s kind of a horror movie. I don’t disagree."
Dominic Smithers