For the third time in its history, there's a tie. Zero Dark Thirty and Skyfall both just won for best sound editing.
In 1968, Barbara Steisand shared the best actress honour with Katherine Hepburn, for Funny Girl and The Lion in Winter respectively.
In '31, it was Fredric March (Dr. Jekyll and Mr. Hyde) fighting over the statue with Wallace Beery (The Champ).
So glad I outsourced my "memory" to Google.