I've just been looking at the news online when I saw this article on Yahoo News. Its really quite funny, hope you laugh as much as I did.
"WARNING: Headbanging to Metallica, Motorhead or Megadeth could be hazardous to your health.
So concludes the first-ever study, published Thursday, of the fin-de-siecle dance style in which afficionados of heavy metal jerk their heads up and down to a fast and furious beat.
Declan Patton and Andrew McIntosh at the School for Risk and Safety Sciences at the University of New South Wales in Sydney, attended hard rock and heavy metal concerts to observe headbanging techniques.
Violent Haze website now back online. 
