Place this clip at the reaction beat right after the mistake lands, then follow it with a huh sound button for a confused double-take, or precede it with a wrong answer game show button when a quiz choice goes badly in the edit.
关于此声音
This clip is a single drawn-out vocal 'uuuuuuuuuuuuuuu' held for about 2.6 seconds, with no words or music behind it. The sound feels awkward and bemused, like a drawn-out reaction when someone is stuck for an answer, and that lingering discomfort is what makes listeners find it funny rather than serious.