Place it right after the on-screen question about joining, as the reply beat in the middle of the edit, then follow it with Awkward Crickets when nobody answers. For a busier group-chat scene, open with Among Us Sus before the question so the suspicion sets up the request.
Über diesen Sound
This is a very short spoken clip, lasting about two seconds, built around the question in its title. A single voice asks it plainly, in a short, direct delivery. It feels awkward and slightly confused, like a message sent to the wrong place, and lands best as a brief, deadpan reaction rather than a longer joke.