The line comes from Yoda in Star Wars: Episode I - The Phantom Menace, released in 1999, where the Jedi Master warns about Anakin Skywalker's fear and its dangerous consequences. The full speech continues through anger and hate to suffering, and that chain has been quoted, remixed and parodied for decades. Online, the opening phrase alone became a shorthand for a bad situation escalating, which keeps it useful in reaction videos, edits and memes long after the film's release.