"Put in hours and hours of planning, figure everything down to the last detail, then what? Burglar alarms start going off all overthe place for no sensible reason. A gun fires of its own accord and a man is shot. And a broken-down old house no good for anything but chasing kids has to trip over us. Blind accidents. What can you do against blind accidents?"

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It is the task of the scenarist to invent little pieces of business that are so characteristic and give so deep an insight into his creatures, that their personalities clearly and organically unfold before the eyes of the audience so that the latter feel that the actions of these people are contingent upon their characters, that there exists some kind of a logical fate, and that nothing is left to mere accident or coincidence.

— Ernst Lubitsch