When in college, my son worked as a waiter in a Jakers restaurant. They had a policy that if it wasn't perfect, the meal was free. They had 2 old ladies who came in regularly and always found something wrong to get free food. My son was a perfectionist so the manager always sent him to wait on them. The problem was that they never tipped at all. He had to do twice the work and got nothing for it. He complained to the manager to let others take their turns with them but to no avail.
