So, I'm listening to my songs that begin with L in alphabetical order (as part of my quest to do my entire library that way) and Radiohead's "Like Spinning Plates" comes on. Now, I know that it's composed from the song "I Will" which would be released later on Hail to the Thief being played backwards, but I couldn't think of that at the time. So I'm looking at the information about it and well, let me paste in what I read that gave me goosebumps of thrilledness!
[There's a line in the song about "living in Cloud-Cuckoo-land]
"The hidden booklet found underneath the CD tray of Kid A has a page that references the above lyrics, 'Cloud cuckoo land'."
WHAT HIDDEN BOOKLET?!
Sure enough, I go to my copy of Kid A (which conveniently happens to be within arm's reach of where I sit) and pry open the CD tray. There it is. Lying there like a hidden treasure that has been waiting nine years for me to discover it. It's a booklet full of weird Radiohead-y goodness and I am just so happy :)