The clip comes from HikakinTV, the channel of Hikakin, one of Japan's most widely recognised YouTubers known for beatboxing, product reviews and high energy reactions. His catchphrase style delivery made short lines like this easy to lift as standalone reactions. The mix of a startled nani and an eager yarimashou travels well outside Japanese speaking audiences because the tone carries the meaning. Fans and editors reuse it as a compact meme reaction, especially in gaming and challenge videos where a quick shift from surprise to motivation is the whole joke.