One of my users recently came into the workforce and is literally terrified of her computer. Each sound it makes be it from the speaker or random drive noises causes her to flinch and turn pale. She sits at a custom-built wraparound desk surrounded by her computer, the switchboard, an electric typewriter (she hates that too), and the postal meter. In order to point at the screen I have to stand directly behind her chair.
She was having great problems with the telecoms software convincing herself that she really had downloaded the file. In order to demonstrate that the "dir" command would show her that her files really were in the directory I chose the c:dos directory to use it on.
When the dozens of filenames flickered down the screen she was so panicked that she thrust her chair backwards crushing me between the chair and the typewriter.
To simplify things, I installed Windows and demonstrated how to move files from the folder to the trash can. Later I wandered by her desk and noticed a forest of icons surrounding her trash can. She hadn't managed to hit it once.