For his Oscar-winning role in The Revenant, Leonardo DiCaprio ate a raw bison liver, learned how to use a musket, learned how to build a fire, and studied two Native American languages. Tom Hiddleston actually auditioned to play Thor. He obviously didn't get the role, and we're all glad, because he's wonderful as Thor's brother, Loki. After finding out that she would have to be unclothed in front of Leonardo DiCaprio in Titanic, Kate Winslet decided to break the ice by flashing him upon their first meeting. George Clooney had to beg for his audition for E.R., which subsequently led him to fame and a movie career. O.J. Simpson was originally considered for Arnold Schwarzenegger's role in The Terminator, but was thought to be "too nice" to be menacing. Aaron Paul's now-iconic character of Jesse Pinkman was supposed to perish at the end of Breaking Bad season one, but the show's creator kept Paul around because of his chemistry with Bryan Cranston.