From the available information, this sound is known online mainly by the quoted Russian phrase “Nas 25 tysyach” rather than by a clearly documented official source. It circulates in Russian-speaking meme spaces, reposts and short reaction edits, where the line is used for jokes about numbers, attendance and collective hype. The clip stays useful because the delivery is brief, forceful and easy to repurpose, especially when a video needs a dramatic way to announce that a lot of people have shown up.