Plato was described as a boor and it was said that he never laughed out loud. Yet his dialogues abound with puns, jokes, and humor. Sonja Madeleine Tanner argues that in Plato's dialogues Socrates plays a comical hero who draws heavily from the tradition of comedy in ancient Greece, but also reforms laughter to be applicable to all persons and truly shaming to none. Socrates introduces a form of self-reflective laughter that encourages, rather than stifles, philosophical inquiry. Laughter in the dialogues--both explicit and implied--suggests a view of human nature as incongruous with...