Yu-Gi-Oh began as Kazuki Takahashi's manga in 1996 before the Duel Monsters anime arrived in 2000, following Yugi Muto and the ancient spirit inside his Millennium Puzzle. Whenever duels turned serious, Yugi would switch places with Yami Yugi, marked by this transformation cue and a shift in voice and posture. The moment became one of the series' most repeated signatures, later clipped and reused in AMVs, parodies and short-form edits. Its clear before-and-after meaning keeps it popular for any clip about unlocking hidden confidence.