We have this little night-light in the hallway. It only turns on if a) someone flicks the switch for it, b) the power goes out, or c) there’s a shadow in front of it. Now obviously, if I pass the light during daylight hours, it will turn on because my shadow makes it dark.
But then there are other times, when I glance into the hallway, and I see it flickering on and off randomly. That always freaks me out. But then I realized: the light is directly opposite our bathroom, at the far end of which there is a window. And just outside of that window is a large lilac bush. When the wind shakes the branches, the branches cast shadows inside, thus blocking the sunlight and causing the light to turn on.
Not an entity. Not a faerie. The wind in the trees. Just goes to show you that you need to exhaust every possible route and explanation before assuming something is supernatural.
Now, if the light were to explode suddenly and start screaming at me in Latin… Well, I’d have to Google that.