Place it at the exact cut where the image changes, then follow it with the Eow Cat Meow Sound Effect for a second cat reaction, or lead into it with the Cat Laughing Meme Sound Effect when a joke needs a feline payoff.
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This is a split-second pop, the sharp snap heard when the Pop Cat image switches to its wide-open mouth. It feels silly, cute and a little chaotic, turning one picture change into a sudden funny jolt. It comes from the Pop Cat meme that spread in 2020 around a cat whose mouth opens into a round O shape.