When it’s written on CNN it’s true. So read this very carefully!
Many people wouldn’t last a day in a server’s non-slip shoes.
Refilling glasses, balancing trays and clearing dirty plates with a smile can be taxing. But the prospect of a 15 percent to 20 percent tip at the end of the meal is the reason waiters work so hard.
read further at How to drive your waiter crazy at CNN.com. (read also the comments!)