Goodness knows how long I've been using earphones like this. Since my first Sony Walkman, I guess. So that would be the 1980s then. Since before you were born, probably.
But the one thing that I've never really understood was why they were marked left and right, so you knew which ear to stick each in. Because does it really matter which way round you hear things?
Now in case you didn't already know, I'm left handed. And that means that I always put my earphones in the wrong ears. That's because I prefer the shorter of the two leads in my left ear, which means I can then reach the controller with my left hand. Sounds sensible, doesn't it? And I've never felt that I was listening to things the wrong way round.
And then last week I was catching up with Monty Halls (that's him up there) on iPlyer on my phone. He was out at sea and throwing fish over the side of the boat. To the right, as I was looking at it. But the splashes in my ears were on the left.
That confused me, I can tell you.