EXCLUSIVE: See 10 Fun Facts Every Diehard 'TFIOS' Fan Should Know!

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20th Century Fox

The hardest scene to film was the pivotal moment on the bench when Gus tells Hazel his cancer is back.

"They were sitting on a public bench in Amsterdam — there were boats coming by, there was people taking pictures of them, there was people yelling," Josh says.

"Shai and Ansel were trying to do one of the most emotional scenes of the movie with a lot of noise and a lot of disturbances that can pull their attention away from the work that we’re doing."