An anointed elderly sister in our neighboring congregation was just nuts in general, later partly because of old age.
She complained to elders that some JW who visited her had stolen her soup.
She went to a bank office to withdraw some money, then went ballistic when her balance wasn't what she thought it would be. She stood there in a crowded bank cussing and swearing and invoking Jehovah's name and Armageddon and her being anointed and whatnot. A total clusterfuck. The sister who accompanied her to help her out a bit died a thousand deaths, and may or may not have walked out on her.
She also once told a man in a wheelchair that God promised him he would be able to walk and run again in Paradise. The man wasn't interested. She walked away, but not before telling him (hard to translate the exact condescension and evil wit): "Then just keep sitting there!"
When she really went off the rails due to old age she was housed in a home for the elderly, where she happily told other (non-JW) residents they'd be DFed for celebrating their birthday or smoking.
Another one is more like asshole-type person and less of a crazy person story.
One day a family of 3 walked into our hall. Man, pregnant woman, young child. They were refugees from the Balkan war, housed in the refugee camp ('center for asylum seekers') in our town. They asked the elders about hospital arrangements in connection to no-blood insanity and giving birth.
So several people in the congregation visited the family in the refugee center a few times. The women was really kind and sweet but the man was a bit odd for a JW. Sometimes he was gone for a week or two, leaving his pregnant wife and young daughter alone in the crowded refugee center.
Then some day - when his wife was almost due - her asked my mother if he could take his wife and daughter in for a week or two. He really had to go back to Bosnia to renew his drivers license. My mother told him no, but we'll be taking care of your family in the refugee center. So my mother, my sister and I took care of them. My sister even spent a few nights in the refugee center.
It was an odd situation. After all, who travels 1500km to go back to a war zone to renew a drivers license?
Then we heard from people well-versed in Balkan culture that (apparently) men can't just leave their wife....unless they nake sure she's taken care of by someone. Like....my mother if she had taken the sister in our home..?
Anyway not much later the man traveled to the Balkan again, and when he came back he was arrested with a car full of booze and cigarettes. He had been a smuggler all that time. Such a nice brotherhood :-\