Well I assume you want surprises that could actually happen...not out of the ballpark such as HAIRSPRAY for Best Picture...or out of this world, such as Lindsay Lohan for Best Actress.
That being said, surprises that could actually happen:
-Ratatouille for Best Picture
-La Vie En Rose for Best Picture
-The Diving Bell And The Butterfly for Best Picture
Out of the ballpark:
-Andy Griffith for Best Supporting Actor (Waitress)
Out of the world:
-Adrienne Shelley for Best Original Screenplay (Waitress)
"The Spectacle has, indeed, an emotional attraction of its own, but, of all the parts, it is the least artistic, and connected least with the art of poetry. For the power of Tragedy, we may be sure, is felt even apart from representation and actors. Besides, the production of spectacular effects depends more on the art of the stage machinist than on that of the poet."
--Aristotle