“The human race has only one really effective weapon, and that is laughter.” The words are those of Mark Twain, né Samuel Clemens, and the philosophy gets a healthy workout in Samuel Clemens: Tales of Mark Twain, Joe Baer’s one-man retrospective of the life and works—but mostly the life—of America’s great author. Baer loves his subject, and he works up a worthy retelling of Clemens’s life and times. He might have labored harder to carry them into a modern perspective, but it’s still a pleasant, leisurely ride.