Put it immediately after the questionable claim, then follow with Anime Wow to escalate the reaction, or save Dramatic Dun Dun Dun for the later moment the claim falls apart.
Sobre este som
This is a brief Japanese spoken reaction, lasting under two seconds, in which Gorori stretches out “honto kanaa?” in a soft, curious voice. It feels gently doubtful rather than confrontational, like innocent surprise shading into quiet skepticism. Gorori is a character from Japanese children's television, and the line became a compact reaction clip online.