Man thinks he is living inside Grand Theft Auto: sent to psychiatric facility

In 2001, the Journal of the Royal Society of Medicine reported that a man was imprisoned for stealing cars and assaulting people with weapons, then sent to a psychiatric facility for "acting in a bizarre manner." It turns out he thought he was playing Grand Theft Auto (the article doesn't say it was GTA, but what other game could it be?)

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A young man was admitted from prison to a psychiatric facility after reports that he had been acting in a bizarre manner. He had been arrested for stealing motor vehicles and assaults with weapons. At interview he was found to be experiencing the delusion that he was a player inside a computer game (adult-certificate game, widely available) in which points are scored for stealing cars, killing assailants and avoiding police vehicles. Psychotic symptoms had emerged slowly over two years. His family had noticed him becoming increasingly withdrawn and isolated from social activities. He developed delusions that strangers were planning to kill him and also experienced auditory hallucinations, constantly hearing an abusive and derogatory voice. Previously a computer enthusiast, he began to play computer games incessantly. He felt that the games were communicating with him via the headphones. In a complex delusional system he came to believe he was inside one of these games and had to steal a car to start scoring points. He broke into a car and drove off at speed, believing he had `invulnerable' fuel and so could not run out of petrol. To gain points he chose to steal increasingly powerful vehicles, threatening and assaulting the owners with weapons. Later he said he would have had no regrets if he had killed someone, since this would have increased his score.

This reminds me of the guy in Robert Lindner's book about psychiatric curiosities, The Fifty Minute Hour, who thought he was John Carter of Mars (or maybe Cordwainer Smith, as this guy believes).

Link(Via Mindhacks)