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Dinner table banter ('Alien')
Scott and screenwriter Dan O'Bannon's intent with the Nostromo crew was to paint them as, essentially, "truckers in space," and there's a naturalistic banter established between the characters right off the bat that goes a long way in selling us on that idea. Their boisterous first conversation around the dinner table is a jarring counterpoint to the elegant opening sequence that directly precedes it.