At my 55th class reunion, the woman who had humiliated me for four years handed me an apron and said, “Be a dear—the hotel is short-handed, and you’ve always belonged in the back.” Her table erupted in laughter. I smiled, tied the apron around my waist, and served them for exactly one hour and ten minutes. Then, at 9:00, the hotel manager entered carrying a leather folder, scanned the ballroom, and asked a question that wiped the smirk right off her face.

At my 55th class reunion, the woman who had humiliated me for four years handed me an apron and said, “Be a dear—the hotel is short-handed, and you’ve always belonged in the back.” Her table...