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Lead singer Thom Yorke was drunk and improvising when he recorded the vocals. The band came to the studio after drinking a lot of wine, and Yorke lied on the floor and sang. He did only one take.
The original title was "Planet Xerox," but Xerox is a copyrighted name and would have caused problems if they used it.
The album title refers to a condition divers get when they come to the surface too fast. It is a commentary on Radiohead's sudden fame.
The drums in this song were cut up from different parts of other songs from the sessions for the album. (thanks, Charlie - Stittstown, Canada)
Yorke: "The product of a single sex education, romantic novels and art college." (thanks, Bertrand - Paris, France)