do interstitial remarks on bootlegs count? on the so-called Honeymoon Tapes
during one of Keith's attempts to get his companion Stroker to shut up,
Stroker replies "Peachy's gone south" - which is a quote from The Man Who Would Be King
(a Kipling story, the film of which Keith has called one of his favourites).
ahem, that was pretty obscure in more ways than one! how about this:
on the b-stage in Austin Mick says "i can see the whites of your eyes now";
here's what he's referring to: [
www.bartleby.com]