A blackout occur and this cause the mental patients to panic. Most of them got out of the mental hospital. The city will be filled with these crazy guys if you are not going to get them.
Drive your van around the city so that you can get all these mental patients that are creating havoc in the city. No patient is innocent as you need to get them all. The idea of the game is to destroy anything on your path. You can imagine the mass destruction that this game cause, but this is just a game and you must understand that you need to separate a game from a real thing.