For many years, I managed a company that owned numerous commercial and residential properties in San Francisco, so I frequently got to see some pretty amazing cases of hoarding and squalor. Among the more memorable:
The guy in Room 126. Had lived there for 15 years and collected Nazi stuff, but never dusted. Ever. There was a very even 1-2" pile of dust on everything in the room that he didn't touch in his daily routine. The shelves, books, SS uniforms hanging on the wall, helmets, bed headboard, boxes of German military stuff, all were covered perfectly with this thick layer of dust. Only the bed, chair, and nightstand were clear. The whole room looked gray from all the dust!
The gun collector. Guns everywhere! Handguns, rifles, assault rifles, shotguns. And thousands of rounds of ammo to match. He was a security guard, but he had mental issues, and he'd talk to himself constantly, muttering obscenities and political grievances. He had about a dozen mayonnaise jars filled with his urine, placed about the room. Geez..
The extreme hoarder. We'd had complaints from other tenants about mice coming from his unit, so I had to inspect. I knocked and a voice said to enter. I was only able to open the door far enough to squeeze myself through and immediately saw a wall of stuff piled from floor to about 18 inches from the ceiling. Boxes and boxes and more boxes. I could only walk in a narrow 1' wide path between the walls of stuff and the apartment wall. There was light, but I couldn't tell the source. A man asked what I wanted and I told him why I was there. I couldn't see him. He sounded to be above me. I entered further, rounded a corner and saw only more piles and boxes. The voice spoke again, and it was then I realized the man was laying on TOP of the center pile, 12-18" from the ceiling - it was his bed! Good god. The rest of the apartment was the same - boxes stacked to the ceiling, narrow paths, and dim light. And it was filthy! Even the kitchen was like this - right next to the stove!! What a fire hazard! Needless to say, mice were everywhere, living in a rodents dream world.
You never really know how people live.