The sales director of the Flemington Nissan dealership in the central New Jersey town of Flemington is a man named Bob Golomb. […] Since starting in the car business more than a decade ago, Golomb has sold, on average, about twenty cars a month, which is more than double what the average car salesman sells. On his desk Golomb has a row of five gold stars, given to him by his dealership in honor of his performance. In the world of car salesmen, Golomb is a virtuoso.

[…]

He’s the Evelyn Harrison of car selling. He has a quiet, watchful intelligence and a courtly charm. He is thoughtful and attentive. He’s a wonderful listener. He has, he says, three simple rules that guide his every action: “Take care of the customer. Take care of the customer. Take care of the customer.” If you buy a car from Bob Golomb, he will be on the phone to you the next day, making sure everything is all right. If you come to the dealership but don’t end up buying anything, he’ll call you the next day, thanking you for stopping by. “You always put on your best face, even if you are having a bad day. You leave that behind,” he says. “Even if things are horrendous at home, you give the customer your best.”

From Blink: The Power Of Thinking Without Thinking by Malcolm Gladwell. Even if you don’t sell cars, there’s something that you can pick from that little excerpt.