For those who actually read Internet RFC’s (there are a few of us), the ones that get released on April 1 can be hilarious.

This year’s, The Transmission of IP Datagrams over the Semaphore Flag Signaling System (SFSS) is funny.

Here’s part of the introduction:
This document specifies IP-SFS, a method for the encapsulation and
transmission of IPv4/IPv6 packets over the Semaphore Flag Signaling
System (SFSS). The SFSS is an internationally recognized alphabetic
communication system based upon the waving of a pair of hand-held
flags [JCroft, Wikipedia]. Under the SFSS, each alphabetic character
or control signal is indicated by a particular flag pattern, called a
Semaphore Flag Signal (SFS).

I especially like the symbols showing how to hold the flags. Note how the hands wave for the “error” signal:

_\0/_
/|\
/ \