Professor Oak is the Pokemon professor from the long-running Pokemon games and anime, where he introduces new trainers and studies Pokemon in the Kanto region. Short reaction clips of familiar characters like Oak have become staples of online soundboards because they carry instant recognition without needing context. This surprise clip circulates in that meme and editing culture, where a half-second of shock can punctuate a reveal far more effectively than dialogue. Its continued use comes from that simplicity, as creators reuse a trusted, nostalgic reaction for new jokes and unexpected moments.