Throughout his career, Sean Penn has built a reputation around his volatility. He's no stranger to controversy and at this point is known almost equally for his outbursts as he is for his acting talent.
Today, Sean and his non-profit organization CORE is once again making headlines after an abusive e-mail was leaked to the press. Over the course of Sean's 2, 200-word letter, his feelings are made abundantly clear: shape up or ship out.