hmmm...very convincing, they have one of three expanations (IMHO):
1. I prefer this one: they're fake
2. This one's alright too: they're a coincidence, or some sort of scientifically explainable abnormality
3. I'm not afraid of this, but most people dread it: a demon, they often pretend to be what we call "ghosts" and "spirits", and are very good at that, I've heard plenty of stories about that
but still, it is kinda freaky
I was afraid at first, the shadows were always shifting at night, and I was always seeing strange things, but I'm fine now I've found this out