Occasionally you get some luck in pictures. More occasionally you have had luck. If something happens that wasn't premeditated, photograph it.
Source: In Friendly Advice, ed. Jon Winokur, 1990.
-- John Sean O'Feeny Ford, (Feb 1 1895-1973), US director; He is best known for western films including Stagecoach, 1939; his films won six Oscars.