I thought that was already fairly well known via things like "IP over Avian Carriers".
Yes, RFC 2324[1] is also serious business because it’s implemented in the real world. Or at least I have implemented HTTP 418 I’m a teapot. (I’ve also seen gross violations where some APIs use HTTP 418 as their custom error code instead of complying with the RFC.)
I know a lot of people disagree with the IETF's policy of imprisoning those who fail to comply with the RFC, but personally I don't think they go far enough.