Celebrity Afterlife on Instagram: "Did you know that the man who famously joked, "I used to do drugs. I still do, but I used to, too," was so dedicated to his craft that he once wrote a three-page fan letter to a pen company? While the world saw Mitch Hedberg as the ultimate laid-back stoner, he was actually a meticulous writing obsessive who refused to use anything but a legal pad and his favorite Uni-ball pens to document the surreal truths of the world. If you could leave one "Mitch-style" tr