As a web developer, I have always heard stories pertaining to the lack of knowledge people have about computers in general. Maybe you have heard the one about the person who called tech support because her computer wouldn't come on ... during a power outage. Or maybe you are familiar with the story about the guy who used his CD tray as a cup holder.
The scary thing is that these stories are true, and many are contained in Tales from the Tech Line, which was edited by David Pogue.
It's mildly frightening to me how little people know about computers, but at the same time, I realize that some of these stories are fairly old. One story involves a newspaper reporter who was typing a story with her monitor off ... and though the brightness just needed to be adjusted. At the same time, there's a story about a woman who was installing hardware, but the tech support person forgot to tell her to turn the computer off.
The moral of the story is that there are a lot of things people don't know about computers. Furthermore, people like to pretend to know more than they do. Combining those two ingredients usually makes for a humorous story, and you'll find many of those in this excerpt book.