Richard Morgan, representing Christie's, said McCartney wrote the lyrics for "Hey Jude" in 1967 and 1968 but had provided no evidence that he had ever owned the piece of paper on which they were written. -- a disagreement about who properly owns the handwritten lyrics to "Hey Jude"

incentive to retain the receipts for every ream of paper you've ever bought, just so you can one day prove you owned the paper.