I once had a (literally) crazy neighbor. This was my experience.

This happened in January of 2008. Actually, it was a collection of incidents starting in December of 2007, then culminating into this fiasco which finally involved landlords.

First of all, please understand that I fully sympathize with people who have mental illnesses.

However, when your neighbor does stuff like this, sympathy can really only go so far.
Besides, this is less about her and more about how funny-and-then-disturbing the video itself is.
It doesn't actually show you my neighbor, only the sounds she made which could be heard through the walls.
In fact, there are some spots in it when the audio had to be tweaked enough for the viewer to hear her.

As you can hear in the video, she had issues with screaming/yelling at all hours of the day and night. I even called the cops on her for some of the stuff she was yelling, as some of it seemed very threatening in nature to....someone. And that's just it - she lived alone. All of those noises were made by herself, and at.....no one. Nevertheless, when the cops arrived, she never answered the door, nor did she make a single sound like she had when I originally called them. Therefore, they couldn't do anything.

At any rate, I'll let the video speak for itself.
Also, sorry for the language. I was much more outspoken back then than I am now. ;-)