RFC-1149: IP over Avian Carriers
Another gem from back when the internet was fun:<p>HTTP Status 418: I'm a teapot - <a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/418" rel="nofollow">https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/418</a><p>Wasn't there also a protocol for checking vending machines for cold drinks?