Comedy and philosophy have too often been thought immiscible, a tradition supported by a solemn reading of philosophers such as Plato. A closer look at Plato – and specifically at what may be his most familiar dialogue – the Republic, suggests just the contrary. Far from immiscible, comedy and philosophy are entwined in ways that are mutually illuminating. I argue that a joke in Book V reveals the self-forgetting involved in founding the city in speech, and so illustrates the vitality (...) of self-knowledge to political ventures. Glaucon criticizes the first city in speech as akin to one “of sows”, prompting a new city altogether, and yet the city that he helps to create not only eradicates distinctions between animals and humans but is founded on principles of animal husbandry and described overwhelmingly in animalistic terms. Justice in this city is defined as a minding of one’s own business, but what exactly “one’s own” is expands to accommodate Glaucon’s pleonexia and accompanying tyrannical allowances. Glaucon has forgotten himself. Without a limit – without a restriction on what one’s own is – the city degenerates into a tyranny. Glaucon’s self-forgetting may be a minor, comical incident, but it has significant philosophical consequences, including a radical undercutting of the city in question as well as the distinction between humans and animals. The comical mode employed here suggests that it may be a comical understanding of the self that best supersedes the forgotten self. (shrink)