Place it right after the price or bill is shown, as the punchline of the scene, then follow it with Nope when the other person protests and Okay Let's Go as everyone leaves the table without paying.
關於此聲音
This is a short spoken Portuguese phrase, lasting about 1.6 seconds, delivered as a quick one-line joke about putting a bill on someone else's tab. It feels cheeky and lighthearted, like a playful dodge when the check arrives, with a teasing tone that makes the deflection land as a laugh rather than a complaint.