Put it just after the surprising reveal, then follow it with Nope if the claim turns out false, or with Okay Let's Go if it turns out true, so the edit moves from question to a clear answer.
Sobre este som
A short spoken line lasting about 1.3 seconds, with a voice asking 'It's real, right?' in a hesitant, questioning tone. It carries a feeling of disbelief mixed with hope that something strange might actually be true. The line comes from Shin Megami Tensei IV, where that uncertain question fits a moment of surprise.