"I Did Something Bad" is a song by American singer-songwriter Taylor Swift, taken from her sixth studio album, Reputation (2017). The song was written by Swift and its producers, Max Martin and Shellback. It features a heavy electronic production that combines electro-trap, grunge and EDM elements, incorporating manipulated vocals and electronic instruments. The lyrics are about Swift's lack of remorse after acknowledging her allegedly wrongful behaviors that caused a sensation, inspired by the female characters Sansa and Arya Stark of the fantasy series Game of Thrones.