The look of shock
By the look on the youngster’s face, he had no idea that someone would call his bluff. He appeared to believe he was untouchable while sitting there with his mother, but the fellow on the subway had other ideas.

There was no way he could ride the entire length of the subway to his stop without instilling in this youngster the values of sharing. When the guy went to sit down, the kid couldn’t believe it, and when he was done sitting, the kid was shocked.