"I Knew You Were Trouble" by Taylor Swift is a high-energy 2012 Red album track about recognizing a toxic, fast-paced relationship and accepting responsibility for ignoring the warning signs. The song's theme centers on personal accountability and regret, with lyrics that use metaphors of falling to describe the intense but fleeting nature of the relationship. It is noted for its early foray into pop-driven, dubstep-influenced production and features a dramatic music video highlighting themes of lost innocence and identity. You can find the full lyrics at: AZLyrics Apple Music