"Down Is the New Up" (2007)
At first blush, it's pretty bizarre — albeit fitting, given the song's commitment to confusion — that this immense B-side didn't find a home on In Rainbows (it wound up on the disc of bonus tracks that was released alongside the album's CD release). On the other hand, this sniveling, carnivalesque piano jam is so discombobulating that it feels like the perfect complement to the album that flipped the music industry on its head. Kicking off with some of Radiohead's characteristically ominous instructions ("Pour yourself a hot bath, pour yourself a drink/Nothing's gonna happen without a warning …"), this unusually rich deep cut soon bubbles into a full-blown falsetto nightmare that would be even scarier if it weren't so damn enjoyable. D.E.