else if (collision.tag == "Bullet")
        {
            // Only allow the method to fire once (ScoreUpdateSpecial())
            _scoreOnce = true;

            // You killed a boss therefore your counter goes up
            UIController.bossSpaceshipCounter++;
            Debug.Log(UIController.bossSpaceshipCounter);

            // Update the score in the score script
            _uIController.ScoreUpdateSpecial();

            // Make a copy of the explosion prefab to indicate an enemy death
            Instantiate(_explosionPrefab, transform.position, Quaternion.identity);

            // Play explosion sound
            AudioSource.PlayClipAtPoint(_alienExplosion, Camera.main.transform.position, 1f);

            // Make a copy of the _textPrefab score to indicate an enemy score
            Instantiate(_textPrefab, transform.position + new Vector3(0.1f, 1.1f, 0), Quaternion.identity);

            // Destroy the left bullet
            Destroy(collision.gameObject);
            // Destroy the enemy
            Destroy(this.gameObject);
        }
        else if (collision.tag == "Bullet2")
        {
            if (_scoreOnce == true)
            {
                // Update the score in the score script to make it double
                _uIController.ScoreUpdateSpecialDouble();

                // Make a copy of the explosion prefab to indicate an enemy death
                Instantiate(_explosionPrefab, transform.position, Quaternion.identity);

                // Play explosion sound
                AudioSource.PlayClipAtPoint(_alienExplosion, Camera.main.transform.position, 1f);

                // Make a copy of the _textPrefab score to indicate an enemy score
                Instantiate(_textPrefab, transform.position + new Vector3(0.1f, -1.1f, 0), Quaternion.identity);

                // Destroy the right bullet
                Destroy(collision.gameObject);
                // Destroy the enemy
                Destroy(this.gameObject);
            }

            // This allows the method to fire once only
            if (_scoreOnce == false)
            {
                // Update the score in the score script
                _uIController.ScoreUpdateSpecial();

                // Make a copy of the explosion prefab to indicate an enemy death
                Instantiate(_explosionPrefab, transform.position, Quaternion.identity);

                // Play explosion sound
                AudioSource.PlayClipAtPoint(_alienExplosion, Camera.main.transform.position, 1f);

                // Make a copy of the _textPrefab score to indicate an enemy score
                Instantiate(_textPrefab, transform.position + new Vector3(0.1f, -1.1f, 0), Quaternion.identity);

                // Destroy the right bullet
                Destroy(collision.gameObject);
                // Destroy the enemy
                Destroy(this.gameObject);
            }
        }