Adrien Brody, The Pianist
For the movie The Pianist, Adrian Brody moved out of his apartment, sold his car, disconnected his phone, and moved to Europe with only 2 bags to get in touch with the misery of his character. He also went on a strict diet and lost 30-pounds in 6 weeks, took piano lessons, and took dialect lessons. He wanted to experience real sadness in life to convey the emotions of his character in an honest way.