Xiǎo shíhòu bèi gǒu yǎo guò, chéng le wǒ de tóngnián yīnyǐng.
Getting bitten by a dog as a kid became my childhood trauma.
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Used both seriously (psychology, memoir) and lightheartedly online — playing a scary level in a game, watching a creepy cartoon, eating something awful all get called 童年阴影 for comic effect.