A couple years ago, I read a cursed book. This wasn't surprising, given the book was about curses. In Cursed in New England: Stories of Damned Yankees, (by Joseph Citro) the inscription was as follows:
Steal not this book my honest friend
For fear the Gallows should be your end
And when you die the Lord will say
And where's the Book you stole away?
--Traditional book curse
Book curses were common in medieval times. Most curses promised damnation, excommunication, or anathema.
I'm not an overly superstitious person, but I do believe in curses, to a point. The book mentioned above is about curses in New England, where I'm from, so I grew up around more than one. Curses are most powerful when the recipient believes in them, but a person in severe emotional distress "casting" one can also have a big effect. I highly recommend the book if you're interested in the subject of curses in general. Just don't steal it. ;-)
I may have to study poetry and write some anti-piracy book curses of my own. Honestly, aside from my vehemence toward book pirates, I think it'd be fun. What do you all think? Would you put a curse on your book? :-)