370HSSV 0773H
Bush was baffled, so he typed it out and emailed it to Colin Powell.
Colin and his aides had no clue either so they sent it to the CIA.
No one could solve it so it went to the NSA and then to MIT and NASA and the Secret Service. Eventually they asked Britain's MI6 for help.
They cabled the White House:
"Tell the President he is looking at the message upside down."