Customer: “The stop button on your roulette wheel isn’t working.”

Me: “Let me see.”

(I put a token into the machine. I allow the customer to play to show me what’s wrong.)

Customer: “See, now when I hit the stop button, it keeps going.”

Me: “The stop button only starts it slowing down to stop.”

Customer: “No, I mean the ball.”

Me: “Sir, the button does not control the ball.”

Customer: “What does?”

Me: “Physics?”