Breaking Bad has no many outstanding scenes but one that will forever be remembered is between Mike and Walt in the episode Half Measures (Season 3, Episode 12)
Mike then tells Walt a story about confronting a chronic wife abuser back when he was a beat cop. Mike intervened, and almost killed the wife-beater, but gave in when the abuser promised to change his ways. Shortly thereafter the man beat his wife to death. Mike’s mistake was to take a half measure when he should have killed the abuser. “No more half measures, Walter,” he says referring to Jesse.
Breaking Bad - Los Pollos Hermanos 