It's been said that courtesy is a quiet power. Having a door held open while carrying an armful of packages is a welcomed common courtesy. Extended courtesies are even more powerful because they are not expected. They show extra effort you expend to please someone like a customer, causing that person to feel valued and special. Extended courtesies to customers are also powerful because they benefit your employer's reputation. The more unexpected a courtesy, the more impact it has on the recipient.  A handwritten thank-you note in the age of email is an example. A phone call to a helpful co-worker is another. Cultivate a repertoire of courteous acts and use them to make the right impression. You will elevate your organization, and very likely your career.