Place it right at the reveal in a reaction edit, after the build-up shot and before your caption lands. Follow it with the Womp Womp Fail for a bigger flop, or precede it with the Awkward Moment for a failed plan sequence that builds toward the letdown.
حول هذا الصوت
This clip is a very short Blue Archive emoticon motion cue for a sad expression, lasting under a second. It gives a listener a small, deflated feeling, like disappointment landing instantly instead of building up slowly. The effect is cute but downcast, making the sadness feel light, exaggerated and instantly readable in a reaction moment.