14) Jim Carrey in Man on the Moon
Jim Carrey, while portraying the role of stand up comedian - Andy Kaufman, adopted such intense method acting that he often got into clashes with his co-stars for being rude. Still he refused to break character and even started committing pranks on people just like Kaufman would do. He even spent a huge amount of time with Andy in real life, learning and embodying his mannerisms.
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Edited by Mudeet Arora