This is rather a silly proposition. Most people shouldn't be driving a car or playing CD's by that criteria. Most people have only a smattering of knowledge about how electricity works.
OK. That doesn't change my opinion; if you don't understand (in basic principal) how a car works, you shouldn't operate one. I made sure my daughter knew the basics of how a car operates (she can change the oil, tires, replace brake shoes and pads, and diagnose many common car problems, and identify all major components, what they do, and explain in principle how internal combustion engines and several transmissions work) before she got her license. Same for any other machinery.
You can verify this by asking them why it is a flashlight won't work at all when you turn the batteries around backwards, but you can make an electric motor spin backwards by reversing the wires.
Perhaps you can explain this, but I doubt if one in 500 average Americans can.
Well, you'll have to explain about the flashlight one, because in principle it should work, and in actuality it works fine on all of my flashlights around the house (I just tested 'em, they all work with the batteries reversed). Well, I didn't test the rechargeables, because I didn't want to break into their battery cases, though I would understand why they would no longer *charge* if the battery were reversed.
A DC motor usually works backwards when you reverse the wires, however, it can be designed to turn the same way regardless of the polarity - indeed, that is how an AC motor works.