Osama
After numerous rounds of "We don't even know if Osama is still alive",
Osama himself decided to send George Bush a letter in his
own handwriting to let him know he was still in the game.
Bush opened the letter and it contained a single line of coded message:
370H-SSV-0773H
Bush was baffled, so he e-mailed it to Condoleezza Rice. Condi and her
aides had not a clue either, so they sent it to the FBI.
No one could solve it at the FBI so it went to the CIA, then to MI6 and
Mossad. Eventually they asked Australian Intelligence (ASIO) for help.
Within a minute ASIO emailed the White House with this reply: "Tell the
President he's holding the message upside down."