Case in point:
Really I'm Just Preserving These For Posterity Now:
And then there was The Thing With The Stones.
Look, "stone" is kind of an invisible word, all right? It's not obtrusive, it describes a thing that isn't usually terribly obtrusive.
I used it a lot. I didn't even notice I was doing it. In my defense, neither did my editor until the second draft, when she was hunting for word echoes, because it's really an unobtrusive little word.
Her growing discovery of this problem is reflected in the sidebar.
(I realize that I have just doomed all my readers to notice every single use of the word "stone" in my book, but seriously, this is why we have editors. They make things better. I write a very clean draft as these things go, and I still need this kind of intervention on a regular basis.)
Eventually the madness culminates in her singing the song of her people (namely editors) at me: