It looks like Australia's great white shark population has AC/DC fans in its midst.  Matt Waller -- a charter boat operator Down Under -- has researched the sharks' behavior patterns for years.  Waller tells Australia's ABC News that the sharks act "less aggressive" when they listen to AC/DC tracks.  He adds that the 1980 song "You Shook Me All Night Long" is particularly effective in terms of behavior modification.  Waller adds that he went through a number of albums to get to AC/DC's catalog which, he says, "really hits the mark".