Zodiac-340
Unsolved cipher-taunt thought to be from the Zodiac Killer:
(http://www.zodiackiller.com/340Cipher.html)
http://www.opordanalytical.com/articles1/zodiac-340.htmhilarious also hilarious huh? (source) FBI effort (attached) - starts out looking good, then the language model takes over and it seems nearly as laughable