Place it right after the mistake is revealed, then follow it with Oh My God Wow as the follow-up or No No Wait Wait if the situation keeps getting worse, keeping the focus on the person caught out.
关于此声音
This short clip is a spoken reaction of just under three seconds, with a drawn-out voice groaning 'oh gawd, oh jeezus' in weary disbelief. It lands as comic dread for a moment that has gone badly wrong, the kind of sigh you let out when there is nothing useful left to say, only embarrassment and resignation left hanging in the air.