Gandalf the Grave
During the filming of the Hobbit movies Sir Ian McKellen, who plays Gandalf, had to shoot most of his scenes alone with nothing but green screens. Being a seasoned actor, this caused him much pain to the point of him breaking down crying on set. "This isn't why I became an actor" he sobbed, and later said that “It was so distressing and off-putting and difficult that I thought ‘I don’t want to make this film if this is what I’m going to have to do’. It’s not what I do for a living. I act with other people, I don’t act on my own."