Under anesthetic, subdivided and synthetic

What gets me about the joke is that doesn't entirely make sense. For example, if you tell a joke where the family's act is for the father to slaughter his family, and the act is named "O.J. Simpson," I'd have some vague sense of the logic there. Here, though, I have no idea what aristocrats have to do with unthinkable debauchery, so it makes about as much sense as a "Michael Jackson is fat" joke.