There is no single famous source for this clip, which is part of why it works as a general reaction sound. The phrase close your mic please comes from everyday gaming and voice chat culture, where players routinely ask each other to mute an open microphone picking up background noise. As short soundboards and meme audio libraries grew, the line was clipped, shared, and reused in stream highlights, Discord jokes, and edited gameplay videos. Its staying power comes from that everyday usefulness rather than from one viral moment.