[it hits peter in the face with a whump, and for a moment he's still. then he takes the blanket and burritos himself in it, scowling from under the hem with pretty obviously faux petulance. then he tries to bury his face even more, but it's pretty damn obvious when his shoulders start shaking that he's laughing, even if it's those sort of half-hysterical uncontrollable giggles.]
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You jumped like a splashed cat.