For a little while after we moved in, the Boy, then age three, had a disconcerting habit of referring to The Changeout People. One memorable time, as we ate dinner, he indicated that they were sitting among us in the empty chairs. We told friends, and they revealed that their daughter, when they moved to their old farmhouse, told them about The Haircatchers, who lived in the walls.
How's the hair on your neck? Mine too.
So at work now we try to come up with these things. The Dustbreathers are pretty scary. And the Fingerprint Thief may come to you in the night.
So, beware, is all I'm saying.