Leaving The O.C. (2006)

We understand why Mischa Barton thought it would be a smart move to leave the most beloved teen drama of this generation. By the end of the third season, storylines and ratings were tanking and she was the show's brightest star. Why not ditch the small screen for movie star glory? The problem is, Mischa didn't realize that people loved Marissa Cooper as a character more than her as an actress. She never got another role that good, and her consistently manic behavior made sure she never got a chance to.