ON ACTING: "Discoveries" and "Surprises"
Moments of discovery and surprise are, by definition, never anticipated. Characters are caught unawares. In this way the idea of a ‘moment to moment’ performance wraps itself around the concepts of discovery and surprise. Discovery and surprise can only happen to the actor-as-character when the actor-as-character is living "moment to moment"; not in anticipation. Anticipation is dramatically antagonistic to discovery/surprise; it is fatally toxic.
Writers call these discoveries and surprises "reversals of fortune". They are really major character transitions in the plot, and exceedingly revealing moments and change (developments) in the character’s life.