http://www.html-faq.com/faq.php?key=flame
This insult goes a long ways back. It's always been fun to read, but it transforms from place to place. I'm not sure that anyone (except the creator) knows exactly what the original version was - I have been unable to locate it. However, it certainly is entertaining.
[Edit - Oooh! Original source!
http://www.guymacon.com/insult.txt ]