I am reading 20,000 Leagues Under the Sea.  It was a big surprise to find out that the monster was a submarine.  Now I know why the cannon balls bounced right off the monster.  I was surprised when Captain Nemo said that his pen was made out of whalebone and the ink was made out of squid ink.  I was also surprised when Captain Nemo said he had twelve thousand books in his library, and he had read all of them.  That would totally finish the Forty Book Challenge!