The other day a much younger colleague and I were discussing something. We each sent the other an email expressing the same thought that crossed in the internet ether.
Her reaction was to say “jinx.” Mine was to say “you owe me a Coke,” which I’m sure baffled her. And as I thought about my reflexive response, I realized that “you owe me a Coke” even baffled me. That’s been my standard response to two people saying the same thing at the same time for as long as I can remember, but I have no idea why that’s the correct phrase to say at that moment, or even when I learned to say “you owe me a Coke” under those circumstances. I’m guessing it happened when I was a kid and some older and more worldly kid used that phrase and explained that it was what you do when that happens, and you need to say it before the other person does. I promptly incorporated that notion into my understanding of how the world works, as kids do, and there it remains. I’ve forgotten the incident, but definitely remember the phrase.
Internet searches don’t really shed any light on why anyone–me included–would say “you owe me a Coke” in this scenario. It’s recognized as one of the things you do when people say the same thing at the same time. (According to some websites, another thing that you can do is punch the other person in the arm, and now that I think of it, I seem to remember getting slugged in the arm a few times, too.) But the origins of “you owe me a Coke” seem to be lost in the mists of time. Who came up with that notion? Why would one person need to buy the other a soda, and why a Coke, specifically? And for that matter, has anyone ever really lived up to the obligation and actually bought the person who said it first a Coke?
It’s just destined to be one of life’s enduring mysteries, I suppose.