I clean houses for a living, and one of my regular clients is a wealthy family whose huge home takes me an entire day to clean. One day, I found a note on the kitchen counter that made me furious: “We placed 15 coins in hard-to-reach spots to test your work. Find them all.” I decided to prove myself without saying a word. I cleaned every inch of the house, checking behind radiators, on top of door frames, under furniture feet, and even inside a light fixture I technically wasn’t supposed to touch. I found all 15 coins, stacked them perfectly in the center of the kitchen table, placed my invoice underneath, and added a note: “All 15, feel free to check.” I also found their feedback form in a drawer, filled it out myself, and left it on top. When they returned, the wife called me in a panic—not about the coins, but because her husband’s expensive watch was missing from the bedside table. I had actually found it behind the headboard during my search, carefully placed it in the top drawer, and left a note saying, “Found in one of those hard-to-reach spots.” She went completely silent, then asked if I was available every two weeks. I said yes—and doubled my rate. They never tested me again….