Man, some customers are so entitled! Guy comes in wanting an oil change and hands me a coupon from a different business! I go thru his history while he's standing there and notice he has never bought anything other than oil changes...ever. His car is desperately overdue for a major service. But he just wants to get an oil change done. So I quote him full price for an oil change, but he demands a discount because he is "such a good customer"....I told him "I'll see what I can do."