Wry grows ever more articulate. In the evening, I point my camera towards him and he suddenly shouts, "Cheese!" Another word in his vocabulary! But where did he pick it up from? I never tell anyone to say cheese. To do so would be to violate my photographic technique.
It must have happened at day care. At dare care, he gets his picture taken every day for the class on-line newsletter. The picture taker must have told him to say, "cheese!"