The great philosopher Aristotle once said "Humor is the only test of gravity, for a subject which will not bear raillery is suspicious." Taking this tenet to task, Cathart and Klein tackle all the major philosophical perspectives--ancient and postmodern alike--and make them universally accessible through hilarious jokes that cut straight to the core of the principle. Hobbes, for instance, believed that life is "solitary, poor, nasty, brutish, and short." Why then, the authors ask, did he complain about it being short?