The no tipper.

A woman at a restaurant asks for lemonade more than four times. The waitress is being super nice and gets all three food orders quick. She goes back to the table every five minutes to see if there's anything else the customers need. When going to pay, the woman that kept asking for things picks up her receipt and just signs her name. She then puts it facing down so her friends won't notice that she didn't leave anything. Once they all get up one of the friends asks how much money they left for the waitress and the one that didn't tip tried to change the subject quickly.