This story happened before I had my third eye opened, around six years ago.
My mother had a new maidservant since the old one quit to marry just a week before (in Indonesia is is usual for a common family to have one or two maids since the salary for maid here is very low, mine costs just $50 per month per person). She was working in another house before, and that house had a big banyan tree in the yard.
One night, around a month after she came, she was feeling a bit sick, and since it was the rainy season where people easily get sniffles, I gave her medicines (the one that makes you feel sleepy after eating) and told her to rest. At this time, my parents were going to another city and left me alone in the house, while my brother was out staying in his friend's house (shiatty brother he is).
I was playing online game until around 2AM when I heard the voice of the other maidservant screaming just outside my door, and when I opened the door, my sick maidservant fell inside. Apparently she was leaning on my door the whole time and had been scratching my door, only I heard nothing since the sound from my computer drowned any other small sounds and I was concentrating to the game. Her eyes were red and rolled half-upward. Now, I am not a weak girl, trained in karate, and not easily got scared by these things, but when you see a girl with devil-like red eyes with her eyeballs only half visible, deranged expression, scratching the door and crawling towards you while whispering your name with a very different, very heavy man's voice, even the toughest man can freak out.
My other maidservant was outside the door and screaming for me to get out. I leaped over her and ran with the other girl outside the house, locked the door tightly, and called my friends over (four muscled young men who were playing billiard close-by). One of them had some knowledge about spirits and possession. Once they came, we went back inside the house and to my room, but my maidservant was lying unconscious on my floor. The four guys removed her to the living room, but suddenly she opened her eyes and raged like crazy, struggling with their hold. Even those four muscled, strong guys could barely held her still. She looked at me and laughed evilly.
The other maidservant was a Muslim, as was the possessed one, so she started reciting Kursi sura from the Qoran, which Moslem believed had the power to expel spirits. I started to disbelieve it, since instead of coming out, the spirit laughed and said that she read the sura wrong, and started recited the sura perfectly itself, mocking her. Despite the situation, seeing things like that, I could not help laughing, making her stopped reciting and snapped at me, only that the four guys held her together and she could not struggle free.
No choice here, we had to communicate with it and find what the thing wanted from my maidservant. The spirit said he was the former inhabitant of the banyan tree from my maidservant's previous workplace, and that he liked her, and had twice possessed her, freaking out her former employers who fired her. After that, the spirit followed her to my house, and had been looking for a chance to possess her again, which came tonight, when her body was weak. When we asked him why he possessed her and made her suffer if he liked her, he said because the maidservant once returned home in vacation without asking his permission or even saying goodbye to him (which is normal since she couldn't see the thing and was unaware of his presence!), so when she came back he swore to have his payback.
My friend then told him that she did not know about him or his feelings, and she could not be blamed, but if he would leave her now, we would tell her about him and asked him what kind of conduct did he wish from her. But if he did not want to leave, he would have to do it with force. The spirit said he only wanted the girl to offer some kind of incense to him every Friday Kliwon (Javanese adds five more specific day besides the common week name which are pahing, wage, pon, kliwon, and legi, and Friday Kliwon is the most sacred day for spirits), asked his permission in everything she did, and said 'excuse me' three times whenever she came into her room because it was where the spirit would stay if he leaves her body. We agreed to his conditions, and the thing left her.
She fell limply to the carpet, and did not wake up until an hour later, asking what happened and why her whole body felt sore. We explained everything to her, much to her surprise and horror, poor girl.
The next day she retired, and went back to her home village, because she was afraid the existence of her and the spirit would disturb my family. I was not that sanguine, since she was a very diligent and kind person. Besides, the spirit's existence didn't really bother me, on the contrary I found him rather amusing. But still, she left.
I never see or meet her again after that, but I hope the spirit would not bother her again.