At the very end of Satanic Majesties, after "On With The Show" and just before the "runout groove" on the LP... there's a weird sounding bit. Speed up your turntable to 78 rpm, and you can hear that it is actually the tune "We Wish You A Merry Christmas".
"And I wish I been out in California When the lights on all the Christmas trees went out But I been burnin' my bell, book and candle And the restoration plays have all gone 'round "