Robert De Niro and Joaquin Phoenix clashed before they even started filming ‘Joker’

Joaquin Phoenix doesn’t do read-throughs, the term for collectively reading aloud from a script before shooting a scene. Robert De Niro, however, insists on them. So before the pair had even appeared in front of a camera together on their new movie “Joker,” they’d clashed over their different acting approaches, according to director Todd Phillips.