I've gone into the basement for something, wood stairs running alongside a concrete wall on my left, a bare bulb lights the stairs but the room to my right is black.
I look into the void and I see a giant spiderweb, light reflecting off of it, it's mounted on a pane of glass and I can see the glass dimly reflecting, it slopes along the line of the stairs, in front of it there's another spiderweb, perhaps a foot away, same, mounted upon glass that I can see dimly reflecting, and I think that I have to tell whoever owns this place that they have problems...
Then I notice, at about the same angle, slanted towards the web, a glass cup, inside a giant black spider, it quickly disappears into the darkness then reappears on the stairs, trying to bite me...