Previous owners had put up an incorrectly placed smoke alarm. It was almost directly over the stove in the kitchen! I took it down when we moved in, but never bothered to take down the housing attached to the wall.

I finally unscrewed it from the wall, filled the screw holes with a little spackle, and touched up the paint (it still had the old color underneath). It’s not perfect but not noticeable unless you know it’s there.

Learn about proper detector placement.