Put this clip at the reveal point itself, after the build-up shot and before the reaction shot. Pair it with a record scratch before for the freeze, then a vine boom after when the joke needs a heavier landing.
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A very short voice clip shouting the word ninja with the final a stretched out, lasting just over half a second. The delivery feels frantic and playful, turning a sudden appearance or stealthy move into an over-the-top, absurd reaction that lands instantly and catches listeners off guard.