NOW, THEREFORE, I, GEORGE W. BUSH, President of the United States of America, do hereby proclaim July 30, 2006, as the 50th Anniversary of our National Motto, "In God We Trust." I call upon the people of the United States to observe this day with appropriate programs, ceremonies, and activities.
Apropos of nothing, it turns out that it's only illegal to write on or otherwise alter money if you do so in such a way and with the intent that it can't be recirculated.
Just FYI.