The sound comes from Kamen Rider Drive, the Toei tokusatsu series that began in 2014, where Kamen Rider Mach and Kamen Rider Chaser use Signal Bikes as transformation devices. Inserting a bike triggers a short electronic signal before the Rider changes form, which is why fans associate the clip with that exact moment in the show. As Drive clips circulated on video platforms and soundboards, the one-second insert sound became a handy shorthand for a sudden upgrade. It remains popular with tokusatsu fans making edits, compilations and toy reviews.