Writer, broadcaster and film-maker Michael Moore caused the controversy of the night at the 75th Academy Awards.
Moore's speech divided the audience
Moore, who won for his anti-gun film Bowling for Columbine, said to loud and prolonged boos and cheers: "We live in the time where we have fictitious election results that elect a fictitious president."
As the noise continued, he added: "We live in a time where we have a man who's sending us to war for fictitious reasons."
Struggling to make himself heard as his alloted time for a speech ran out and the orchestra started to play, he said: "Whether it is the fiction of duct tape or the fiction of orange alerts, we are against this war, Mr Bush.
"Shame on you, Mr Bush. Shame on you."
His fellow nominees joined him on stage, he said because they were showing "solidarity with me, because we like non-fiction, and we are living in fictitious times".
Moore, whose recent book Stupid White Men severely criticised George Bush, was not the only star to comment on the war, but he was certainly the most vociferous.
He had not expected to win the award because of the film's anti-establishment tones, but it was thought a likely winner after it had passed the first Academy hurdle and made the shortlist.
Other stars chose to make their comments about the war with a more humanitarian focus.
"Whoever you believe in, whether it is God or Allah, may he
watch over you and let's pray for a swift resolution," said best actor winner Adrien Brody.
Best supporting actor winner Chris Cooper also made a low key statement as he collected his award.
"In light of all the troubles in this world I wish us all peace," he said.
Despite early fears the Oscar ceremony would have to be cancelled, the event ran smoothly.
The programme was interrupted twice to bring live news of
the bombing campaign in Iraq.
At the end of the show, presenter Steve Martin said: "To our young men and women overseas, we are thinking of you. This is for you."
Michael Moore's speech:
Whoa. On behalf of our producers Kathleen Glynn and Michael Donovan from
Canada, I'd like to thank the Academy for this. I have invited my fellow
documentary nominees on the stage with us, and we would like to - they're
here in solidarity with me because we like non-fiction.
We like non-fiction and we live in fictitious times. We live in the time where we have
fictitious election results that elects a fictitious president. We live in a
time where we have a man sending us to war for fictitious reasons.
Whether it's the fictition of duct tape or fictition of orange alerts we are against
this war, Mr Bush. Shame on you, Mr Bush, shame on you. And any time you got the Pope and the Dixie Chicks against you, your time is up. Thank you