If you have ever worked in customer service, you probably know that some customers can be really rude. You also probably know ...

Angry, frustrated, and entitled customers just come with the retail territory. After a while, you realize that staying calm and disinterested is the best way to really get under their skin. This guy ...

An angry customer at a McDonald’s in Houston, Texas, fatally shot a man who was trying to calm him down, police say. Getty Images/iStockphoto A McDonald’s customer who was angry about his order shot ...