Bookstore? Why wouldn't you say that? What other stores are there on campus? Teller? Are you sure you weren't at a bank? What random cashier at a store would even recognize a young BYU football assistant coach let alone confront them about the results of a game? Most people on campus can't even recognize a player let alone a random assistant. And you were left speechless. I guess that's good. You weren't even a part of this made up conversation so you should have remained silent.