Use it as the opening beat of a reaction sequence, then follow with the Anime Ahh Sound Effect for a bigger surprise and finish with the Awkward Moment Sound Effect when the joke falls flat.
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Hachiware says a single sharp oi in this clip, lasting under a second, with a bright, high voice that cuts through a scene instantly. It feels funny and lightly scolding, sweet rather than angry, like a small friend calling you out before you go too far. The voice belongs to Hachiware from Chiikawa, the Japanese manga and anime series known for short, expressive character moments.