Shirley: "Now that I think about it, maybe the nasty thing was in the woodshed instead of the outhouse."
Bonnie: "Yep, it was the woodshed, and I should have caught that ... sorry, I wasn't thinking, either. Okay, here's a photo of a woodshed. If you click on it and enlarge it, you'll see that the sign above the door says COAL SHED ... even though there is wood inside. Both wood and coal were ways of heating the house, once upon a time. The woodshed was once known as the place misbehaving children were taken to be disciplined by spanking. So maybe THAT was what Aunt Ada Doom saw. Maybe she thought spanking a child was a nasty thing to do to the poor kid."