Use it as the verdict on the scene, straight after the claim you want to challenge, then follow it with a game show buzzer for the wrong answer or emotional damage for the fallout. Keep it to once per edit, as the verdict that closes the claim.
このサウンドについて
This is an eight-second spoken clip in Portuguese built around the phrase 'é mentira', meaning 'it's a lie', delivered as a direct accusation. The voice carries the whole moment, turning a simple denial into a punchy call-out. It feels cheeky and confrontational, like catching someone mid-story and refusing to let the fib slide, which makes it land as playful disbelief rather than a serious argument.