Warning: this article contains spoilers for OppenheimerChristopher Nolan has revealed that one of the most shocking lines in Oppenheimer was improvised.Speaking to The New York Times, Nolan shared that James Remar, who plays U.S. Secretary of War Henry Stimson in the film, came up with the idea for one of the most harrowing and shocking lines to be delivered in the movie.The scene involves Stimson and other government officials meet with J.