Anti-war sentiments were running high in 1974, and some of this passion found itself onstage while British actor David Niven was preparing to introduce Elizabeth Taylor as the Best Picture presenter. Things went awry when a man wearing an impressive mustache, and nothing else, streaked across the stage – unbeknownst, at first, to Niven. Niven casually turned his head to the right, took in the naked spectacle that was this ‘70s man, then returned his attention to his audience – as if the whole thing had been set up and he’d just been waiting to drop his punchline. His extemporaneous response was better than any of the written jokes that night: “Well ladies and gentlemen, that was almost bound to happen. But isn’t it fascinating to think that probably the only laugh that man will ever get in his life is by stripping off and showing his shortcomings?”
http://www.youtube.com/watch?v=2IIl3zSYL8k

Embedding of the clip has been prevented; but, what a great moment. After being practically kicked out of Hollywood, he did come back to receive his honourary Oscar.
http://www.youtube.com/watch?v=J3Pl-qvA1X8

Tatum O'Neal was 10 in this photo...she was given the Best Supporting Actress award in 1973. Shirley Temple, when 6 yrs old, in 1934, was awarded an HONORARY Oscar for her achievements in film

From the 2001 Oscar awards
http://en.wikipedia.org/wiki/Bj%C3%B6rk

http://www.youtube.com/watch?v=AGxL5AFzzMY

Sacheen Littlefeather refusing to accept the Best Actor Oscar® on behalf of Marlon Brando for his performance in "The Godfather" in protest of the treatment of American Indians by the film industry.
http://www.youtube.com/watch?v=2QUacU0I4yU

Director Florian Henckel von Donnersmarck adopted for the Stasi drama "The Lives of Others" the Oscar for best foreign language film opposite.

David Letterman presented Oprah Winfrey to Uma Thurman, wise-cracking, “Uma, Oprah! Oprah, Uma!” He proceeded to repeat this joke ad nauseum.

http://www.youtube.com/watch?v=IynQCmqvXZs