The American said, "The last time I was here, I didn't have to show it."
"Impossible. Americans always have to show your passports on arrival in France!"
The American senior gave the Frenchman a long hard look. Then he quietly explained. "Well, when I came ashore at Omaha Beach on D-Day in 1944 to help liberate this country, I couldn't find any Frenchmen to show it to."