Emily Blunt and Cillian Murphy share a close friendship and are both Oscar-nominated for their roles in Oppenheimer. Blunt slapped Murphy repeatedly in a scene that was not included in the movie, and despite her apology, Murphy encouraged her to do it. The tension of the scene led to Murphy requiring medical treatment. Blunt gifted Murphy a pillow worried about his sleep but he ended up smashing his head on a bedside table. The co-stars have shared a reciprocal bond and admiration for each other's performances.