/* Different instance each scene. */
 private void OnDestroy()
 {
     if (this == _instance)
     {
         _instance = null;
     }
 }
 private void Awake()
 {
     /* Enforce Singleton: */
     if (_instance != null && _instance != this)
     {
         Destroy(this.gameObject);
     }
     else
     {
         _instance = this;
     }
 }