Possession
Possession is a term to name the total control of the body of a person by something. Every religion and nation has their own creatures that control people. Sometimes they are demons, sometimes spirits, sometimes souls of dead people that don't want to pass to netherworld, etc.
If a person is possessed, he/she becomes aggressive, he/she begins to outrage religion and everything connected with it, especially God and saints. Apoplectic convulsions appear and a person can't control them. This person also has some psychological diseases and disorders such as strange behaviour and hallucinations. Besides, a spirit that possesses a person speaks instead of him but using the person's. This spirit may also change the voice of a person. Possessed people feel nervous while hearing prays and during the religious ceremonies. A person may also get some supernatural abilities like levitation, telekinesis, teleportation, etc. And a person may also start speaking unknown languages.
History gives us a lot of examples of possession. Possessions were especially popular during medieval times. A nun said that she was possessed by eight stallions. She says that when she was 14 she had sex with an evil spirit and she saw hall. But priests get this evil spirit out from the body of a nun.
Parapsychology explains possession the next way. They say that it is the transmission of information on distance. But there are no scientific proofs of this theory. There are a lot of films based on possession. They attract the interest of the audience.