Another math story (not HD but he could probably work there):
Customer had a 1" water line but needed more water for some irrigation he wanted to add. After looking over his site, it was determined a 2" line would be adequate. The customer was told he needed to have his 1" line replaced with a 2" inch line. He did not want to pay the 2" tap fee and wanted us to just add another 1" line.
We tried to explain adding another 1" line was not the same as a 2" line. He went ballistic: "Boy, who do you think you are talking to? You trying to tell me 1 and 1 don't equal 2? You city boys think you can come out here..." The conversation was pretty much over. He got his 2nd 1" line and as far as I know, is making do with it.