Anonymous caller told Arizona man he won "worst tipper" after giving delivery driver 10 percent.
mike: “If you have narcissistic personality disorder, you may come across as conceited, boastful or pretentious. You often monopolize conversations. You may belittle or look down on people you perceive as inferior. You may feel a sense of entitlement — and when you don't receive special treatment, you may become impatient or angry.” . From the Mayo Clinic Website.