RFC 2324 - Hyper Text Coffee Pot Control Protocol (HTCPCP/1.0)
http://tools.ietf.org/html/rfc2324#section-2.3.2
"418 I'm a teapot ... Any attempt to brew coffee with a teapot should result in the error code "418 I'm a teapot". The resulting entity body MAY be short and stout. "
xml2rfc
http://xml.resource.org
"take your XML source (using the format defined in RFC 2629 and its unofficial successor) and see how the results look like in the original ASCII look-and-feel or the new modern HTML rendition of that look-and-feel."