Ooh - I have some acting ones.
Lauren Bacall was considered a shoo-in for Best Supporting Actress for "The Mirror Has Two Faces" but lost to... It escapes me, now.
I think Marisa Tomei winning for "My Cousin Vinny" and Mira Sorvino winning for "Mighty Aphrodite" were considered upsets, too, but I can't remember who they won over.
And wasn't Adrian Brody kind of considered an upset Best Actor win for "The Pianist" a couple years ago?
I'd just like to say, again, how totally done I am with the Academy now. I swear on my mother's ashes I will never watch that frigging show again. Nor care about who wins or loses. (OK, OK, if Jake and Heath and others I love win down the road, I admit I'll probably smile just a little when I hear about it the next day. But that's IT. I swear.)