Put it immediately after the failed moment, not before it, so the reaction closes the scene. Build tension first with Sudden Suspense, let this clip answer the fail, then follow with Sad Violin to turn the fail into a longer joke.
關於此聲音
This 3.3-second clip is a drawn-out crowd groan, a chorus of voices stretching out a low 'uuuuhhh' together. It lands as shared disappointment, the sound of a whole room reacting to something awkward, embarrassing or badly timed. It feels knowing and a little cruel, perfect for the moment everyone winces at once.