Something that irks me that really probably shouldn't, is when a customer brings me a car that is totally thrashed inside and out. It takes all afternoon to clean it up and repair their years of neglect. Then when they come to pick it up they suddenly become detail oriented and point out a spot on the tire that didn't get glossed because it was on the bottom when you glossed them or something like that. It shouldn't bother me, and what it really does is just motivate me to be more thorough, but it ticks me off still the same. If they were so detail oriented then their car wouldn't have looked like a dump when I got it. They obviously have no appreciation for how much work it is to transform a heap like that, so really, where do they get off nit picking? Again, it shouldn't bug me since they are the boss and they are paying for perfection, but it does anyway.