code: function(){
  
              var self = this;
              self.pause();
  
              // notify before
              this.emit('destroy');
  
              // remove all listeners
              self.off( true );
              // remove everything
              self.remove( self.getBodies() );
              self.remove( self.getBehaviors() );
              self.integrator( null );
              self.renderer( null );
          }
docs: Physics.world#destroy()
  
  Destroy the world.
  (Bwahahahahaha!)