In 2007 when Peter H. Salus and I published all the April Fools RFCs in one book we also included the poetry RFCs and the funny RFCs published outside of April Fools timeframe.
Speaking of which... we included "RFC 2410: The NULL Encryption Algorithm and Its Use With IPsec" because, well, I thought it was funny. Specifying an encryption scheme for IPsec that does not encrypt the bytes is, well, funny. It turns out it wasn't published as a joke. Oops. No offense meant to the authors R. Glenn and S. Kent.
Nobody pointed this out to me until years after the book was printed. Sadly because this book is printed on dead trees we can't "take it back".
We don't have a new edition that includes the 2008-2013 RFCs but those are pretty easy to find. The book does include some commentary that isn't available on-line. That includes forewords by Mike O'Dell, Scott Bradner, and Brad Templeton. I re-read them today and was impressed at how they have stood the test of time.
More about the book here:
Order it on Amazon here:
Tom Limoncelli
Ironically, this year's April Fools RFC is about The NULL Packet http://tools.ietf.org/html/rfc6592