In a track-by-track interview with NME.com, Amy said about the song:
Sick, okay, this is the song that was one of the first one we came up with when we had like a band jam session, about a year ago. And I don't know, we were really excited about it right away. Sometimes you get in a room with a group of people and try to write a song together and it just doesn't work. The more brains you get going, sometimes the more disjointed it becomes and the more directions start getting pulled apart. .