Final answer:
The man in the black Buick seems to have an understanding of a shared experience or knowledge that transcends social boundaries, connecting past and present perceptions.
Step-by-step explanation:
The excerpts provided revolve around an understanding of social dynamics, personal insights, and the complexities of identity within different contexts. Specifically, the passage seems to suggest that the man in the black Buick has insight into a shared experience or knowledge that transcends age or occupation, something universally recognized or understood despite social boundaries. Given the lack of detailed context, it seems that the man knows something thought to be an exclusive piece of knowledge among children who played football, pointing to an awareness that connects past experiences with present perceptions. This recognition of shared experiences or knowledge likely relates to broader themes of human connectivity and empathy across different walks of life.