I am a huge advocate of treat the customer the way that you would like to be treated. I don't care if I am getting a mortgage through your bank or if you are handing me a greasy bag of fried food from a drive thru window. I want to be treated with a smile and a sense that you like your job. I like to walk into businesses and be acknowledged. A smile and simple "Hi, how are you today?" would more than suffice. With the right attitude those words have a huge impact on the way people view your business and employees.