Place it at the end of a fake offer, after No No Wait Wait builds the hesitation and before Oh My God Wow captures the other person's reaction, so the edit moves from offer to reversal to response.
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This is a short spoken line, lasting just under three seconds, in which a voice says 'Just kidding, I'm gonna keep it' with a playful, teasing delivery. It feels cheeky and lighthearted, like a joke that flips into a confident change of mind, and it works best as a quick punchline rather than a serious statement.