After numerous rounds of 'We don't even know if Osama bin Laden is still alive', Osama himself decided to send George Bush a letter in his own hand writing to let him know he was still in the game.
Bush opened the letter and it contained a single line of coded message:
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, and then to MI6.
Eventually they asked the Mossad (Israeli intelligence) for help.
Within a minute the Mossad emailed the White House with this reply:
'Tell the President he's holding the note upside down.'