And you thought overdue fines were bad! I came across this quote a couple years ago. I desperately wanted to post it in the library I worked at but my boss would not allow it. =) I did post it in my own little area where my pictures are hanging. No one really sees it, but I think about it as I'm looking daggers at anyone walking around with a book they haven't checked out. (Not that I'm possessive or anything!)

For him that steals, or borrows and returns not, a book from its owner, let it change into a serpent in his hand and rend him.

Let him be struck with palsy, and all his members blasted. Let him languish in pain crying aloud for mercy, and let there be no surcease to his agony till he sing in dissolution. Let bookworms gnaw at his entrails in token of the Worm that dieth not.

And when at last he goes to his final punishment, let the flames of Hell consume him forever.

--From an inscription at the library of the San Pedro monastery in Barcelona