There exists an IEEE standard for
gigabit token ring networking.
No, I don't know why. It was approved May 4, 2001, so I guess it wasn't the IEEE's answer to
all those RFCs we know and love.
(Also, why is it that so many of the April Fool's RFCs have to do with IP? There's IP over carrier pigeon, IP over carrier pigeon with quality of service, electricity over IP, the Evil Bit in the IPv4 header, IPv6 over Social Networks, IP over ATM, IP over semaphore...)