if ( Input.GetMouseButtonDown (0)){
RaycastHit hit;
Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
if ( Physics.Raycast (ray,out hit,100.0f)) {
StartCoroutine(ScaleMe(hit.transform));
Debug.Log("You selected the " + hit.transform.name); // ensure you picked right object
}
}