Place it at the end of a short edit once the exclusion is clear, after the moment of realisation and before the group's reaction. Pair it first with It Was At This Moment He Knew to set up the realisation, then follow it with Bruh Meme as the group's reply.
Über diesen Sound
This is a short spoken Portuguese line, lasting about two seconds, delivered as a blunt, self-deprecating complaint that everyone else is taking part while the speaker is left out. It lands as awkward, funny and slightly exasperated, the kind of line that makes a listener laugh at being on the outside of the joke.