After numerous rounds of "We don't even know if Osama is still alive", Osama himself decided to send George W. a letter in his own handwriting to let him know he was still in the game. Bush opened the letter and it appeared to contain a coded message:
Bush was baffled, so he e-mailed it to Colin Powell. Colin and his aides had no clue either so they sent it to the FBI. No one could solve it so it went to the CIA, and then to the NSA, then to the Secret Service. With no clue as to it's meaning, they eventually asked Canada's RCMP for help.
The RCMP cabled the White House as follows:
"Tell the President he is looking at the message upside down"