Place it right after the strange reveal in an edit, letting the moment breathe before the reaction arrives. Follow it with Anime Wow for a bigger response, or put Dun Dun Dun before it when the discovery needs a heavier build-up first.
关于此声音
This is a short German voice clip in which a speaker stretches out 'Ach jaa' before asking 'Was ist das?' in a tone of puzzled curiosity. It feels bemused and lightly amused, like catching something unexpected and not quite believing it. The drawn-out opening gives the question a comic pause, making the reaction feel genuine, awkward and easy to recognise.