Once upon a time there lived a blonde who knew nothing about computers. One day, he left for work and left the computer on. The blonde called her husband and asked her husband how to turn it off. He gave her these specific instructions:
Move the mouse to the "start" button. Click with the left button. After that, press "shut down." Click "shut down" your computer and it will shut down.
An hour later she calls her husband telling him she can't shutdown the computer and that she's just going to give up. Later that day, the husband comes home and shuts down the computer. He asks her what she did and she picks up the mouse, puts it on the screen where "start" is and clicks.