Okay so there are these people. They are full solid black with no special features. I can only catch glimpses of them but they are there.
Earliest I can remember them I was 9. I used to see them running past windows. 
They usually appear when I'm alone, I'll be minding my business and then suddenly one of these shadow people are caught in the edge of my peripherals. 
Any of you had these freaks in your lives?