This is something that happened when I was younger. I have confirmed with my parents it truly happened.
I can remember us kids upstairs in the loft playing, we could hear our uncles yelling, cheering as they watched the soccer game. While we were playing we heard three knocks on the door, no one was there. With the third knock the door flew open and this gush of wind came in from out of nowhere and the lights went out. We could hear screaming, crying and banging it sounded like a train went by.
I was so scared as I felt the coldness through my spine. Then a voice came from nowhere. I couldn't understand it but the sound of it was frightening, it sounded like a record being played backwards.
The priest was called to bless the house that same day. My aunt kept fainting as well as other things happening, there are to many details to fit but whatever it was finally left.
Two days later the priest died (death unknown). My aunt never knew how or what split her lip open but she still has a huge ugly scare. My uncle says they did some remolding in the house and my aunt found a beautiful ring. She refused to put it back and he seems to think it was maybe the ghost of the owner trying to claim the ring back. He said that is why the entity split her lip open. After everything happened she did place the ring back in the wall.