...the scene in which Han Solo is about to be frozen in carbonite and Princess Leia tells him "I love you."
Ford's scripted response was "I know," but he reportedly felt that the line was too flat and unemotional for the moment.
On the day of shooting, he suggested the line "I love you too," and the rest is history.
(, Sat 8 Apr 2023, 3:47, archived)