Place it right before the moment a character realises something is wrong, then follow it with the Vine Boom Sound Effect for the reveal and the Bell Ding Sound Effect to reset the scene for the next joke.
关于此声音
This is a single sharp, high-pitched chirp lasting about a second, modelled on a household smoke detector warning that its battery is low. It lands as tense and irritating, the kind of small noise that breaks silence and makes everyone in the room pause and listen. It comes from that everyday detector sound, instantly familiar without belonging to any one film, show or character.