A couple of weeks ago, we took our 2 kids & one grandkid to dinner at Deckhand Oyster Bar in Round Rock - a birthday celebration. Pretty good food, pretty good service. The bill was ~$110. The waitress was the cashier. I don't pay by credit card in this scenario. So, cash - a bunch of $20s and $10s including a $20 tip from my SWMBO/CFO. Waitress leaves with the knowledge that we don't need change & comes back a few seconds later. She approaches my grown son - not we who paid for the meal. Whispers in sons ear & gives him the bill. He passes the bill back to me. Evidently we short-changed her on the tip & were (by my count) ~$20 short, ie, no tip. SWMBO hands over another twenty immediately, succumbing to the embarrassment factor & never once suspecting fraud. Lesson learned: I will from now on, especially on a high dollar meal tab, count out the money at the table in the waitstaffs presence.