Also, let's talk about talking. Or, more specifically, language and the uses thereof. Get out your vocabulary books and follow along.
It's more than that, though. There are whole volumes of specialized languages, jargon, slang, and just good old fashioned secret languages. We'll discuss the worst accent in movie history, where that accent was meant to come from, and, best of all, get at the story behind thieves cant in D&D and why you can't speak lawful neutral any more.