The track comes from Super Mario 64, released for the Nintendo 64 in 1996 with music by Koji Kondo. It plays in the merry-go-round room beneath Big Boo's Haunt, a haunted house level where Boos circle the player. Short clips and loops later spread through gaming videos, remixes and meme edits, where the innocent carousel melody became shorthand for something sweet turning strange. Its long life online owes a lot to nostalgia for the game and to how instantly the circling waltz sets a mood.