The linoleum floor of the elementary school hallway always smelled like a mixture of industrial floor wax and dried apple juice. It was a Tuesday afternoon, and Ryan, his father (my father-in-law, Arthur), and I were walking toward Susie’s classroom for the early pick-up. We were all in high spirits—the school was hosting “Donuts with Dad” the following Friday, and Ryan had been looking forward to showing off his daughter to the other fathers.