The Parrot and the Seances

Many spiritualists had helpers who would rap on the windows and produce ethereal voices or sounds. 

However, a spiritualist in Osuna, Spain, had a parrot as a helper.
This spiritualist spent innumerable hours teaching her parrot different phrases. 
During the seances, the parrot would say certain things on queue from its spot hidden behind some drapes. The parrot's voice was said to be the voice of a long-dead nun.
During one particular seance in 1913, the parrot decided that enough was enough and flew out from behind the curtains, landing on the seance table.
 This naturally generated a lot of anger, and the people at the seance mobbed the spiritualist and left her severely injured.