JonTron, the stage name of YouTuber Jonathan Jafari, built a large audience in the 2010s with loud, theatrical reviews of video games and films. Short reaction clips pulled from his videos, including thoughtful hums and exaggerated double takes, became staples of meme editing because his delivery is so readable. The 'hmm hmm' works as a universal thinking sound, so editors reuse it whenever a character needs a beat of comic suspicion. Its popularity endures because the moment fits almost any awkward pause.