A customer bought groceries worth $86 at my small shop. He handed me $100, collected his bag, and left. A few minutes later, he returned. “You gave me $4 instead of $14.” I checked the till. He was right. I apologized and gave him the missing $10. He counted it twice before leaving. The next morning, he came back with another complaint. He said I had charged him $7 too much for a bag of rice the previous week. I checked my records. The price was correct. He insisted I was lying, so I refunded him the $7 just to end the argument. My assistant watched him leave and said, “That man knows how to get free money from you.” I told her I would rather lose $7 than lose a customer over an argument. Two weeks later, the same man walked in while I was serving another customer. He placed $100 on the counter.