Place it straight after the excuse in your edit, opening with a WhatsApp message sound to set up the chat, then let this clip answer it before a laugh closes the exchange.
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This is a short spoken clip, just over six seconds long, centred on a voice asking why someone is lying. The delivery is direct and teasing, which makes it feel funny and a little awkward, like calling a friend out in front of everyone. It works best as a quick, pointed reaction rather than a long exchange.