In 1936, cinematographer Hal Mohr made history as the first and only person to win an Oscar via a write-in vote. He wasn't even an official nominee for his work on 'A Midsummer Night's Dream,' but a massive campaign by his peers led to his victory. The Academy was so shocked by this outcome that they changed the rules immediately after the ceremony to ban write-in candidates, ensuring that only officially announced nominees could win moving forward.