Put it at the start of the reveal, then follow with the Dun Dun Dun sound for the guilty pause, and finish with the Vine Boom sound when the joke lands. That order builds the arrest moment, lets the middle beat breathe, and gives the ending a clear punch.
关于此声音
This clip is a very short police siren, lasting just over three tenths of a second, with a sharp rising and falling two-tone wail. It lands as a sudden burst of urgency, funny when it interrupts a calm moment and tense when it suggests trouble is arriving. The sound is instantly recognisable, so it works as a quick alarm that needs no explanation.