ROBERT “That's one thousand, five hundred dollars and sixty cents.” The grocery clerk at the supermarket's front desk told me, and I smiled curtly at the young man. Taking out my wallet, I handed twenty-hundred-dollar bills to him, adding, “You can keep the change.” “Robert—” As we left the store, I heard Renee gasp, and I shrugged. “Oh, my God! Thank you very much, sir!” The attendant called out from behind me, and I waved my hands in response, despite having my back to him. Renee looked at me as she pushed the trolley. She was trying to hide a smile, I could tell. “Here, give that to me.” I offered and before she could hand the trolley over, I pushed her aside and took hold of it. “I see you're desperate to say something to me about the tip I gave the clerk.” I said as we wa