Several years back I had recently built a new computer for my dad. My dad, while probably not as competent as most of the El Reg reader base, is pretty handy with a computer. He calls me for anything that involves opening the case or for especially stubborn software problems, but generally speaking he's comfortably in the 'power user' category. My mother, on the other hand, would never touch a computer if she had a choice and is really only able to run the few programs she needs for her job as a nurse, none of which would be likely to be found on a home PC.
The case I had gotten for dad had a huge power button, a 3 inch circle on the front of the case, with a much smaller reset button inset into the edge of it. For some reason mom needed to get on the computer - a circumstance that already trips the "what is going on here" response - and called me in a panic.
"This computer won't turn on!"
"Ok...you're hitting the power button on the tower, right?"
"Yes, I'm not quite that hopeless."
"Which button on the tower are you hitting?"
"I only see one."
"There's a big one and a little one and they're right next to each other."
"All I see is a button and a logo."
And at that point it became obvious what she was doing.
"Push the logo."
"Oh, it's turning on now."
"Yeah, that was the power button. The little one you were pushing was the reset button."
I love my mother to death, but I thank all that is holy that the computer room at their house is my dad's domain, especially after that call.