(Be advised of a very minor spoiler ahead for mother! and the length of Domhnall Gleeson's screen time in it.) Audiences were not fans of director Darren Aronofsky's new thriller mother!, awarding the fairly well-reviewed film an "F" CinemaScore in exit polling. But mother! does have a big supporter in actor Domhnall Gleeson, who has a small role in it and championed the film during my recent phone chat with him.