I think the goal is to make a well written scene seem like it's improvised and/or to come up with things that you find in the room that you couldn't have known until you get into the real situation, just try to improve things as you go along.
Robert Downey, Jr.I would say that among my many huge emotional miscalculations was my taking a film career for granted. It is the most awesome privilege to be able to use one's imagination and wit, physicality and musicality, conscious brain and unconscious instinct in the service of a work that has a chance to move and excite and amuse and delight people all over the world, including long after we're dead. What a noble calling! And I felt it was just there for me as a kind of given, some sort of inherited birthright-when in reality it's the most magnificent luxury.
Robert Downey, Jr.