private bool waitCheck = true;

    IEnumerator waitFiveSeconds()
    {
        if (waitCheck)
        {
            waitCheck = false;
            yield return new WaitForSeconds(5);
            waitCheck = true;
        }
        Debug.Log("im waiting for five");
    }

    void Start ()
    {
        while (Ball.gameScore > 0)
        {
            int randomNum = Random.Range(0, 10);

            Debug.Log("Number " + (randomNum + 1).ToString());
            GetComponent<Text>().text = scoreTextList[randomNum];
            StartCoroutine("waitFiveSeconds");

            Ball.gameScore--;
        }
    }