The worst place I lived was in a basement of a Victorian house that had been converted to apartments. 5 apartments, with 9 girls living in the building, I was the only singleton.
The summer was okay, but when everything froze over, my apartment became the drainage for the whole building. It started with water on my kitchen floor, bubbling up through a floor drain.
The first time it happened, the landlord came and said it was from the washing machine, and that he would talk to everyone about setting up a schedule. He gave me a nice mop and some floor soap (I was in college, so that was like an early Christmas) and told me to call him if it happened again.
So I did, the next day. And the day after. And every day for a week or so. Until the day I called him screaming because that day, for the first time, it wasn't just a little bubbly water on the floor, it was everywhere in my kitchen and also coming up my shower drain. And, it was full of toilet paper.
He came rushing out with a plumber, because now all of a sudden s**t was real. Literally. The plumber was snaking things all through the bulding, and told the landlord that there was a really stubborn blockage between the house and the street, and that he would need to access it from an opening in the back yard to determine from there what to do.
As soon as they went outside, I got my boots and my bleach and set about furiously mopping my house down for 8 zillionth time. Then I heard yelling from the back yard. Out the window, I could see the plumber and the landlord had obviously breached the line, and were now cowering as (I swear this is how I remember it) a 6 foot high geyser of
shot straight up into the air and rained down on them for a good 15 seconds.
Apparently it wasn't the washing machine after all! We got a new set of rules about what you could and couldn't flush, and it must have worked because my apartment quit flooding. No one made any serious effort to clean up the back yard (how would you, fire?), and since it was all right there outside my kitchen window I decided I just couldn't hang with the whole situation and left as soon as my lease was up.