the other thing about this that's often come to mind for me is that the "who" picked in such things tends to be telling of the speaker, and of their perception of "impenetrable"

relatedly, a somewhat common phrase around this side of the world is/was "it's greek to me". I don't know the history of why it came into public lexicon around here (whether it was imported or grew locally), but been curious.

which leads to my sidebar and sneer: it'd be nice if it were easier to research things like this, and good god the modern internet makes it hard to do that. holy fuck what a tsunami of dogshit. and then fucking LLMs and openai come around, going "HOLD MY BEER". le sigh.