Pop Cat began in October 2020 when a video of a cat named Oatmeal opening its mouth was edited to add a popping sound and looped to music. The clip spread quickly on Twitter, Discord and YouTube, then inspired the Popcat.click counting game that pushed it even further worldwide. Edits placed the cat over songs, with the mouth popping on every beat, turning a simple pet video into a universal meme format. Its short, clean pop still works as a standalone sound for reactions and edits today.