Ain't that the truth. I work in a body shop and there's this one guy with absolutely no sense of humor. Kind of guy that will say something that he thinks is funny but the only one laughing is him. People who walk into my shop love talking to me. I try to be all smiles and jokes. I think it helps them have a better day. Also, it helps if the person I'm talking to is a cute chick.
Let's say, I am an in the enterainment business. My costumers come in sad and usually leave feeling better or at least having the hope that they will feel better.