In the last two or three years we've heard in the news that students at schools suddenly started to shoot on everybody at the school - for no reason, as the mass medias said, - and then made suicide or tried to go to another country. There are several bokks written about such "events". Mass media say us, that there were no reason for these students to do that, the only reason -they became aggressive because they played "killer games" - 3D shooters, like Quake and CounterStrike. but there are some interesting details.