Place this reaction right after the reveal in your edit, not before it. Build tension first with the sudden suspense sound, then use this clip, and follow it with the oh my god wow sound for a bigger group reaction.
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This clip is a short human voice letting out a surprised ooh, lasting just over two seconds. It captures that instant intake of shock when something unexpected happens, sounding amused, startled and a little disbelieving at once. It works because the reaction feels genuine rather than acted, like hearing news you did not see coming.