3. Alice Brady, Best Supporting Actress, In Old Chicago (1937)
Watch The Speech: N/A
Alice Brady was prevented from attending the Oscars to accept the supporting actress statue for In Old Chicago because she was suffering from cancer. An unknown man walked up to take home the award in her place. The Academy assumed that this was planned, but it wasn't. The man and the statue were never seen again.
This is not related to the Curse of the Jane Fonda. For reasons of temporality.