Back in the late nineties, I was giving a computer tutorial to a large group of my co-workers, and was explaining various user interface components of the OS, and one of them was...radio buttons.
I explained that they were like the radio buttons in a car which allowed only one station to be selected...click one, the other one un-clicks.
As I gave this explanation, an attractive young lady sitting there was looking at me so blankly, that I realized with a start...
She had no idea what real radio buttons were.
I aged about twenty years in that instant...:)
Floor dimmer switches for headlights.
I guess that means you never got around to the part where you have to pull the button out to click it, then push it in to click, click it. Then to un click it you had to push a previously clicked button.