Movies
Mr. Corleone never asks a second favor once he's refused the first, understood?
— Tom Hagen • The Godfather

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
A warning about how a powerful man operates: once turned down for a first favor, he won't ask again. It's phrased as a rule laid out to be clearly understood, with 'understood?' signaling the stakes of refusing.
Context reviewed