void OnTriggerEnter2D(Collider2D col)
 {
     if (col.gameObject.tag == "LaserShot")
     {
         GameObject      hitLaser       = col.gameObject;
         LaserController newLaserScript = hitLaser.GetComponent <LaserController>();
         if (newLaserScript.parent != gameObject.GetInstanceID())
         {
             newLaserScript.destroySelf();
             currentHealth -= newLaserScript.damage;
             if (currentHealth <= 0.0f)
             {
                 destroySelf();
             }
         }
     }
 }