I recently found this list of RFCs on my computer. They're slightly old, so they don't include some of the newer April 1st RFCs, and I'm fairly sure it's incomplete, but it's a list of some of the old April Fool's Day RFCs. Some of them are actually funny! :)
- RFC #3093 - Firewall Enhancement Protocol (FEP).
- RFC #3092 - Etymology of "Foo".
- RFC #3091 - Pi Digit Generation Protocol.
- RFC #2795 - The Infinite Monkey Protocol Suite (IMPS).
- RFC #2551 - The Roman Standards Process -- Revision III.
- RFC #2550 - Y10K and Beyond.
- RFC #2549 - IP over Avian Carriers with Quality of Service.
- RFC #2325 - Definitions of Managed Objects for Drip-Type Heated Beverage Hardware Devices using SMIv2
- RFC #2324 - Hyper Text Coffee Pot Control Protocol (HTCPCP/1.0).
- RFC #2323 - IETF Identification and Security Guidelines.
- RFC #2322 - Management of IP numbers by peg-dhcp.
- RFC #2321 - RITA -- The Reliable Internetwork Troubleshooting Agent.
- RFC #2100 - The Naming of Hosts.
- RFC #1927 - Suggested Additional MIME Types for Associating Documents.
- RFC #1926 - An Experimental Encapsulation of IP Datagrams on Top of ATM.
- RFC #1925 - The Twelve Networking Truths.
- RFC #1924 - A Compact Representation of IPv6 Addresses.
- RFC #1776 - The Address is the Message. S. Crocker.
- RFC #1607 - A VIEW FROM THE 21ST CENTURY. V. Cerf.
- RFC #1606 - A Historical Perspective On The Usage Of IP Version 9.
- RFC #1605 - SONET to Sonnet Translation.
- RFC #1438 - Internet Engineering Task Force Statements Of Boredom (SOBs).
- RFC #1437 - The Extension of MIME Content-Types to a New Medium.
- RFC #1313 - Today's Programming for KRFC AM 1313 Internet Talk Radio.
- RFC #1217 - Memo from the Consortium for Slow Commotion Research (CSCR).
- RFC #1216 - Gigabit network economics and paradigm shifts.
- RFC #1149 - Standard for the transmission of IP datagrams on avian carriers.
- RFC #1097 - Telnet subliminal-message option.
- RFC #748 - TELNET RANDOMLY-LOSE Option