The phrase one of us has circulated online for years as a shorthand for playful initiation, appearing in reaction videos, edits, and meme compilations where a group claims a new member. Its appeal comes from how instantly recognizable the chant is, even without any visual context, and how easily it can be reused for fandoms, hobbies, teams, and inside jokes. Because the line is short and rhythmic, creators can loop it, layer it over a reveal, or use a single repetition as a punchline, which has helped it stay in rotation long after its first viral uses.