Place this clip right after the reveal in your edit, then follow it with a vine boom sound button hit for the reaction shot, and close the sequence with a dun dun dun sound button sting on the final freeze frame.
About this sound
This clip is a short alert-style sound effect filed under the name Judo Lemons Alert 2, built to work like a quick warning ping rather than a song or line of dialogue. It gives a listener a puzzled, slightly goofy jolt, the kind of oddball interruption that makes a normal moment feel suddenly urgent and silly at the same time.