This happened today in the morning. I was sitting at my kitchen table, waiting for my food to cook. It was around nine in the morning, and I was staring towards the sliding glass door for no particular reason. I was staring at it for a few minutes, when I see this small grey thing run across the door and around the side of my house. It just appeared out of nowhere, and it was moving fast too.
I thought it was kind of weird because my cat was inside the house, and animals just don't appear out of nowhere like that (and yes, this appeared out of nowhere! Like, it didn't appear behind of something, it came from thin air!) and move that quickly.