Several days ago, I heard some something rustling in my lab when I was up late working in my darkroom and being real quiet. Figured it could just be something settling, but I told the wife we should get mouse traps. Mouse traps are cheap and great fun.
Tonight I was actually woken up from my corpse-like sleep by noises out near the kitchen. LOUD ones. Repetitive, scraping type noises...like a zombie shuffling across the living room carpet, with soup cans tied to his ankles. Or someone out in the kitchen laying tile or something. That loud. I swept the apartment w/1911 and isolated the noise to the bathroom; it stopped when I turned the light on. It came back in about ten minutes after I went back to bed. LOUD scraping. Probably in the walls. I know a quiet apartment can magnify the apparent loudness of sounds, but this sounded more squirrel- or possum-level scraping than rat scraping. Although I'm not prepared to rule out the possibility of a wall-confined zombie.
I opened the ceiling hatch in the bathroom and looked through the ductwork; didn't see anything. I suppose I could lay some poison up there, but then what happens when my noismaker dies in the wall? I could tell the apartment about it, but for all I know they'd come tear my wall out.