Words of wisdom Gonzo, nice article. Please Mr customer, just tell me your problem...that's all we want. We will do the rest!
Reading your article reminded me a funny story (the coil pack reminded me). We had a customer come to the shop with a Ford Explorer with a misfire. We diagnosed a coil and spark plugs, common issue. When we inform the customer he becomes agitated and says, "Hey pal, what are your guys trying to pull, I just did a tune up, I replaced the points, plugs, wires, cap and rotor, the whole nine yards!
Frank, the service advisor said, "Ah, are you sure you are talking about this car, the explorer?" He said "don't touch my car, I am coming right down"
When he came to the shop we just let him scream and yell and carry on. We all watched him make a scene and kept silent.
Finally I pulled him into my office and brought him into the 21 century.
We did the job and never heard from him again.
Be carful, last I saw he was heading WEST!