The song finds Kele Okereke detailing the end of a relationship, comparing the disconnect between two lovers drifting apart to the feeling of two people riding the effects of separate pharmaceuticals. "It's just an image and loose idea of two people being in different places and two different headspaces, almost like they were on two different sets of drugs," he explained to The Sun. "So there was a sense of distance between them that they couldn't beat. It's just an analogy."
Who writes a song about a name they found in a phone book? That's just one of the everyday things these guys find to sing about. Anything in their field of vision or general scope of knowledge is fair game. If you cross paths with them, so are you.