Bon Appétit!

In front of the theater the kid was stooping, eating Chinese food from a white take-out cardboard plate. As I entered the lobby I turned and told him "Bon appétit". As I was wondering why I had said that, the "Merci" that came back was smooth and un-accentuated. A French guy eating in the cold, squatting in front of a theater!
I saw him later on in the lobby at intermission.