Comedy
Well, this is pretty much a no-brainer: The Clouds is definitely an example of Greek comedy. Even while the play is going after Socrates's philosophies and teachings, jokes (and filthy language/potty humor) lighten the mood and make the criticisms funny. We're pretty sure Aristophanes thought his messages about philosophy and politics were serious business, but he delivers his blows with a smile… after all, why shouldn't criticism be fun?