It pays to pay attention to your customers.
My Buick has been a bit sick lately. It sprung a leak in the coolant system just before Thanksgiving, and I have not driven it since.
Saturday, I took it into my Shop. The mechanic immediately came out and presurized the system and showed me the problem. He asked if It would be okay if he waited until today to fix it. I assured him that since I work graveyard, I have not needed the car, and he was welcome to take his time on it.
Today about 4 PM he called me. Let me know that the car was finished. He said he finished it in the morning, but hadn't called because he didn't want to wake me up.
I wouldn't have minded if he had called me in the morning, but it still made my day that he cared enough to hear what I said, and think about it.
Also helps that his bill was less than the quote. How often does that happen?