Shelley's Frankenstein... reading it my mind was absolutely blown. The book in all honesty couldn't be further from any of the films made of it (Branagh's was closest, but Christ that was tripe). I really longed for there to be a spinoff book from the monster's POV, because I felt there was a segment that desperately needed expanding and gave a whole different dynamic to the book. No spoilers here, go and read it!
Clavell's Shogun. Total page turner, and though it was (loosely) based on historical fact so not all *that* much was a surprise, I found the humanity and emotions portrayed amazingly. Also, his King Rat was also a great hard-to-put-down read, and the ending shows a deep shock of cold as the roles are lost in the bite of release.
Orwell's 1984. Not long finished this myself, and it was on my to-do list for a long time. I found most of it underwhelming at best, but jeez, the anger/pity it brought out in me to read the last few pages.... very powerful stuff. Ended in a way I completely did not see coming... to me I always think that's the highest compliment you can pay a writer!