Put this clip between the setup and the payoff in a reaction edit, after the line that raises the question. Then add an Anime Wow to mark the surprise, or a Bell Ding when the realisation finally lands for the viewer.
關於此聲音
This 15-second clip centres on a vocal mmm, a sustained hum from a single voice that stretches across the full length. It feels wry and questioning, like someone weighing an answer and not quite buying it, which makes it feel funny and a little tense.