If these pictures weren't posted on Yahoo! News, I would find it very hard to believe them to be real. But there they are, credited to Reuters photographer Rick Wilking, and accompanied by this caption:
U.S. President George W. Bush writes a note to Secretary of State Condoleezza Rice during a Security Council meeting at the 2005 World Summit and 60th General Assembly of the United Nations in New York September 14, 2005.
I suppose even Presidents need to go to the bathroom.