Place it as the rebuttal in the middle of a debate edit, right after the overconfident claim, then follow it with JoJo To Be Continued to close the scene on a dramatic beat. For a failed boast, add Womp Womp Fail Sound straight after it instead.
关于此声音
This 10-second clip has Escanor from The Seven Deadly Sins asking “Who decided that?” in a deep, slow and composed voice. The delivery feels calm, smug and quietly dominant, turning a simple question into a challenge that makes the other person seem overconfident. It comes from the anime adaptation of the manga Nanatsu no Taizai.