Liáo dào lǎo diànyǐng, Lǎo Zhāng shuō de tèbié shàngjìn.
When the talk turned to old movies, Old Zhang got really fired up.
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Colloquial. 劲 (jìn) here means 'energy / momentum', so 上劲 is literally 'energy goes up' — the moment someone shifts from going through the motions to actually getting into it. Often paired with 越…越上劲 ('the more X, the more into it').