private void DestroyMyPhotonObject () {
PhotonNetwork.Destroy (Ball);
Ball = null;
PhotonNetwork.Destroy (rocketRing);
PhotonNetwork.Destroy (shotGunRing);
rocketRing = null;
shotGunRing = null;
foreach (GameObject obstacle in obstacles) {
PhotonNetwork.Destroy (obstacle);
}
obstacles.Clear ();
}