Plato and a Platypus Walk into a Bar: Understanding Philosophy Through Jokes by Thomas Cathcart, Daniel Klein (2007)

Do philosophy and jokes have the same roots? Reading this short-and-sweet book should prove that they do (although a philosophy treatise will take the long and times boring route to express them). As a quick introduction to all major philosophical approaches (and even offering a significantly condensed timeline), this could be your textbook for Philosophy 101.