This video might be good reason for everyone to get a dashboard cam. 

A minor accident turned into a major explosion after an Australia dude goes bat-turds bonkers on another motorist and chases him down, Grand Theft Auto style, for about fifteen minutes. Dashboard cam dude can't avoid the lunatic after he stops right in front of his car. Nutso jumps on the car hood and tries to shake hands with the driver -- through the windshield.

People down under are bonkers. Would you expect anything less from a country with a TV show called 'Today Tonight'?