Lǎobǎn duō kàn le wǒ yī yǎn, wǒ de nèixīnxì jiù kāishǐ le.
The boss glanced at me one extra time and my mental drama kicked off.
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Originally theater jargon for an actor's internal performance; now overwhelmingly used online to mean 'the elaborate scenes your brain makes up in a tense moment'. 内心戏太多 ('too much inner theatre') is a gentle self-deprecating put-down.