In China, people don't need to pay the tips unless the customers want to do it. But in the western countries, paying tips is necessary if someone serves for you, especially in America. In the TV shows, if the customers forget to pay the tips, the waiters will chase after them for a few blocks just to get the tips, or they will just speak ill words to the customers in their minds. Waiters get the income mainly from tips. Their salary is only 2 or 3 dollars per hour. People need to pay for 20 percent to 40 percent of the total bills as tips. It is decided by the customer. If they like, they can pay 40 percent. The tip is part of the American culture. Though many young people feel like a burden, they still need to respect it.