I Knew You Were Trouble was released in 2012 on Taylor Swift's album Red, written by Swift with Max Martin and Shellback. Its big electronic pop chorus made the title line one of the album's most quoted hooks. Online, the short lyric was clipped from the song and reused on its own, detached from the full track, as a reaction sound. Creators now drop it over stories, edits and reveals where the warning signs were there all along, which keeps the line circulating long after its chart run.