My friend has a thing about barbershops. As soon as he gets in one he's really rude and quickly becomes downright abusive. As a consequence he's gradually been barred from one barber's after another, leaving fewer and fewer for him within reasonable travelling distance.
Eventually it came down to just one. When he went there and asked if they would cut his hair, his reputation must have preceded him. The manager came out and said "We can cut your, but only on condition you treat all our staff with courtesy. Any impolite remark and you're out, and no barber within a fifty mile radius will ever trim your hair again. This is the last chance salon."