It had something to do with Donny and Marie, but for the details you'll just have to wait for the movie (The Tears of a King). Yep, they're going to make a whole damned movie on it, based on the King's copy of the worst book ever written.
Elvis' copy is now owned by the LDS church, and they say he had notes all over it. Like everywhere (there are 89 occurrences) that the word "king" is used, it is underlined.
I don't care what Penn&Teller say, you've got to be on drugs to do something like that.