"Clennon: We wasted hours and hours of rehearsal time discussing fucking metaphysics! Some of the actors were obsessed with this question: When you become the Thing — when the alien takes over your mind and body — do you know that you've become the Thing? Or do you just go on thinking that you are your old self? I couldn't see the point of solving that silly riddle. What difference was it going to make in anybody's performance? The story's point was that every creature looked, sounded and smelled exactly the way it did before the alien took it over."