Place this clip right after the visual punchline, not during the build-up, so the reaction carries the scene. Pair it after a sudden suspense sting for contrast, or follow it with kids cheering when the moment turns into a celebration.
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This clip is a young girl laughing out loud for about 15 seconds, a continuous, high-pitched giggle that keeps bubbling up without words. It feels bright, silly, and contagious, the kind of laugh that makes everyone nearby start smiling even when the joke was not that good.