Place it at the exact frame of the reveal, then follow with the oh my god wow button if you want a second, bigger reaction layered right after. For a comedic fall-off, precede it with a cartoon slip so the shock lands after the mistake.
关于此声音
This is a very short voice clip of someone exclaiming 'Meu Deus' in Portuguese, the equivalent of oh my god, delivered in under a second. It gives a pure hit of shock and disbelief, the kind of stunned reaction you feel when something absurd or unexpected happens right in front of you and words fail for a moment.