Shutter Island, Leonardo DiCaprio

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"We gotta get off this rock, Chuck."

It's been a decade since Martin Scorsese and Leonardo DiCaprio first took us to Shutter Island, their mind-bending adaptation of Dennis Lehane's 2003 novel of the same name that marked the director and his leading man's fourth collaboration in their storied history together. 

The film, which brought to life rather perfectly the story that Lehane wrote to pay homage to Gothic settings, B movies and pulp, starred DiCaprio as U.S. Marshal Edward "Teddy" Daniels, sent to a psychiatric hospital on Shutter Island in Boston Harbor alongside new partner Chuck Aule (Mark Ruffalo) to investigate the Ashecliffe Hospital for the criminally insane after one of the patients goes missing. Along the way, they encounter shifty doctors, patients with alarming messages, one hell of a conspiracy and an even bigger twist ending. Let's just say there's a reason the title is an anagram for "Truth and Lies" and "Truths / Denials."

In honor of 10 years since the film's release on February 19, 2010, we thought we'd round up the 10 most surprising secrets from the making of the film!

Shutter Island, Leonardo DiCaprio, Mark Ruffalo

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Shutter Island, Leonardo DiCaprio, Martin Scorsese

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Shutter Island, Leonardo DiCaprio, Mark Ruffalo

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Shutter Island, Leonardo DiCaprio, Mark Ruffalo

Paramount/Kobal/Shutterstock

Shutter Island, Leonardo DiCaprio, Michelle Williams

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Shutter Island, Leonardo DiCaprio, Mark Ruffalo, Ben Kingsley

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Shutter Island, Leonardo DiCaprio, Mark Ruffalo, Ben Kingsley

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Shutter Island, Leonardo DiCaprio

Paramount/Kobal/Shutterstock

Shutter Island, Leonardo DiCaprio, Mark Ruffalo

Paramount/Kobal/Shutterstock

Shutter Island, Leonardo DiCaprio, Mark Ruffalo, Martin Scorsese, Ben Kingsley

Paramount/Kobal/Shutterstock

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