Put this clip right after the bill total is revealed in your edit, preceded by the sudden suspense sound to build toward the reveal, then follow it with the oh my god wow button when the reaction needs a bigger group response to close the scene.
Об этом звуке
A very short spoken clip of a voice asking 'Extrato de energia o que?' in Portuguese, delivered as a quick, puzzled question. It lasts just over a second and lands like instant disbelief, turning a confusing bill or charge into a funny, incredulous reaction that needs no setup or explanation.