The Possession of Joseph and Theolbald Bruner
The symptoms became worse with time and eventually their bodies would begin to bloat. Shortly after the bloating, the boys would vomit a lovely mixture of foam, feathers, and seaweed. They vomited all manner of things they had never eaten and many of the objects they vomited weren't even available at the house they lived in. The boys were constantly covered in seaweed and feathers and vomit no matter how often they were cleaned. Their beds levitated and objects in the room around them were flung about inexplicably. The boys also gained psychic abilities and were able to predict the deaths of people in the village. The boys parents eventually sent the boys away for the exorcism ritual and spent the rest of their lives at the St. Charles Orphanage. During their stay at the orphanage they told the nuns that they were "The Lord of Darkness." It took four years to exorcise the boys, during which time they lived in constant torment
Even after the exorcism, there was no happy ending for the two cursed children. One boy died shortly after the exorcism at the age of 16 and the other boy died at 25. The case of the Bruner boys still baffles people to this day. Assuming that the priests and witnesses weren't lying, no natural explanation for what happened to the Bruners has been found. If their case wasn't an elaborate hoax perpetrated by an entire village, orphanage, and the clergy, it is one of the most conclusive cases of possession.