What are the signs of someone being possessed?

The signs of possession, per the Catholic Church, are:

-- Speaking in languages the individual has never learned or even heard. The more obscure (eg: Aramaic), the easier it is to prove. This can include talking in two or more "voices", sometimes at once.

-- Words or Actions that are inappropriate for the victim (eg: false memories, adult or sexual talk or behavior coming from a child, intimate knowledge of a stranger's affairs)

-- Physical strength above and beyond what the individual is capable of, including the capability of self-mutilation seemingly without pain.

-- Loathing the name of God, Jesus, Mary, or the names of any saints or other religious individuals

-- Pain or physical discomfort when coming in physical contact with Holy Water, religious symbols, The Sacraments, or upon hearing Holy Scripture or prayers

All of these things seem to be straight out of the movies, and some easily faked, BUT all have been documented on tape, film, video; as being real many times. The Catholic Church requires all of them to be witnessed by a priest before the Roman Ritual of Exorcism is performed.