h2g2 The Hitchhiker's Guide to the Galaxy: Earth Edition

I work at the tech support call center of a printer company in the multi-functional device que. It amazes me sometimes as to the depths of ignorance some people will wade and still get a complicated peripheral to connect to a computer they're still not all too sure about. I found when I started working here that there are three kinds of customers: Those that know nothing about their computers and are too frightened to do anything but what you tell them to -
Tech: Ok now press 'Start'
Customer: Press 'Start'?
Tech: Yes sir, press 'Start'.
Customer: You want me to press 'Start'?
Then there are those that know quite a bit and have a good idea what you are doing, and follow instructions because that's the smart thing to do -
Tech: Have you ever been to your registry before?
Customer: Quite a bit.
Tech: Ok, let's make a backup first before we make any changes.
Customer: Ok.
Finally, there are those that know just enough to be dangerous -
Tech: How can I help you today?
Customer: Yes, I was not receiving faxes, so I concluded that there must be something wrong with your software. So I went into Windows Explorer and began randomly deleting files, and now I can't even print. There must be something wrong with the unit and you need to replace it.
Tech: Yes sir, absolutely. You take that right back to the vendor along with the computer and trade it for WebTv and a dot matrix printer.
Customer: Why?
Tech: You can do less damage that way, sir.