Oprah has the power to get just about any person she wants on her show, and today's guest was no exception. We're not quite sure what prompted J.K. Rowling to go on "The Oprah Winfrey Show," but whatever it was, we're happy that it happened. The typically private Jo Rowling opened up about her mother's death, her quick rise to fame and, most importantly, whether or not she'd write more "Harry Potter" books. The answer to that big question? Maybe. "They're all in my head still. I could definitely write an eighth, a ninth book," J.K. answered cryptically. "I think I am done, but you never know."