John Mayer

Best known for his song "Your Body is a Wonderland," John Mayer was set on his path toward musicland when he graduated from high school. With his yearbook quote, he wrote, "I know that school never did anything for me. It never made sense to me. I knew when I was 13 what I wanted to do - to be a musician."

We give credit where it's due, and he saw himself through to his goal. We do wonder, though, what is famous ex-girlfriends wish school could have taught him...