Put it at the start of a rejection scene, right after Enemy Spotted flags the unexpected arrival, then follow it with Nope to close the door on them. That order builds the entrance, the call-out and the refusal without needing extra explanation.
關於此聲音
This is a short German voice clip, about six and a half seconds long, built around BastiGHG saying 'nicht eingeladen', or 'not invited'. The delivery is blunt and dismissive, turning an awkward social snub into a quick, knowing laugh for anyone who has ever turned up where they were not wanted.