Some people still think shutting off the monitor means shutting off the computer - even in the case of a flat screen. I've seen this at least 5 times this year alone.
As a web developer the browser issue is the biggest and most consistent for me.
The fact that you don't think these differences still exist perfectly defines the purpose of this list.
Heh. I had this problem with my mom who could never understand that she could record on her VCR even if the TV was off. Or tuned to another channel.
"How did you do that?" she asked.
"I just pushed the power button. This button down here turns the computer on and off."
"But I always just pushed a button on the keyboard and it turned on."
And then I realized that she had never turned her computer off, only put it to sleep, for five years.
We never did manage to convince her...
I was waiting for a much more saucy version of your response after I realized there was some context missing ;)
You're right about the loudspeaker and the microphone example though, since in the most common cases loudspeakers are electromagnetic devices that convert electricity to air pressure in front of a cone, and vice versa.
In fact, almost every piece of electronics can function as a microphone (Coils, capacitors and so on), I built transmitters a long time ago and the measures you have to take to get rid of spurious microphony are pretty draconian.
They viewed the machine as a Magic Box that let them type documents and browse the web and sometimes crashed if they angered it. Some needed help getting CDs out of the tray. Some didn't know that "check if it is plugged in" is a troubleshooting step. Some were very superstitious about crashes ("don't move the monitor!" was my favorite).
If you don't see anyone struggling with these concepts, well, I haven't since I got a programming job 3 years ago. They didn't stop having problems, I just don't see the problems anymore. Always watch out for selection bias: the set of "people you know" isn't representative of the population at large
One can argue against some or all of it's points, but overall message is unarguable.
We are not our own target group. It's very difficult to look at website using mindeset of these people.