The melody comes from Thomas the Tank Engine, the friendly blue locomotive from the long-running children's television series Thomas and Friends, where the upbeat theme has accompanied the character for generations of young viewers. Online, creators began sharing louder, stretched and distorted versions of that familiar tune as a joke, using its wholesome associations for comic contrast in edits, reaction videos and short-form clips. Because almost everyone recognises the tune instantly, the meme version still works as a quick, nostalgic punchline even without any explanation.