Yesterday evening a knock came at the door while at the same time I saw another black bulbous spider crawling below the window frame. I watched it for a moment then answered the door. We talked for 2 mins. When I got back to where the spider had been it was nowhere to be found. I know they are Wiley but this one seemed to just up and disappear. I asked my 17 yo if she saw the spider bu no she hadn't even looked. How am I supposed know if it was real or not?