Yes, I do. I have a neighbor who is very suspicious of everyone around her. 

The biggest incident we experienced was when she got a new car and every time her bumper or paint job gets a scratch, she has the terrible habit of blaming it on people in the neighborhood, as if everyone was out to get her and we scratched her car on purpose. She would go to people's houses to complain and accuse everyone from the kids to the cats of being the culprit. She even made a few official complaints, but since she can't prove anything, nothing came about it. 

Then, one day, out of the blue, she installed three security cameras. She had the cameras positioned so they could see all side of her car clearly. They were only meant to catch the vandals who "scratched" her car. In fact, it even came to the point that whenever people stop to talk near her property line, you will suddenly find her out and about, as if she was on a stakeout and constantly watching her video feeds. 

This went on for a while. Then after sometime, she suddenly had the cameras removed. We only  found out recently that she realized, with the help of her cameras, that the scratches on her car were all accidental. They were the result of her kids and their friends bumping into her car with their backpacks. The backpacks have a lot of metal hardware in them and that's what has been causing the scratches. So, now they're not allowed to hang around it, anymore. 

It was terrible dealing with a neighbor that suspicious of everyone. Mostly, we just ignored her and tried to stay as far away as possible. Given her irrational behavior, we felt that it was best to just avoid conflict. She's not the type to listen to reason once she had her mind up, anyway. And since she wasn't being violent, just annoying, there was no reason to make things worse by retaliating.

I feel this is the best way to deal with annoying neighbors. Getting into a fight with someone you live so close to will only make things worse. By avoiding them, you avoid any conflict. And who knows, maybe they were just going through something and they were taking it out on the neighborhood. This way, once they get over their problem, this gives everyone the chance to still be good neighbors.