NEW YORK: Matt Damon is threatening to steal the show at the Oscars — by throwing a tantrum when he doesn’t win a Best Supporting Actor honour.

The movie star has already accepted he won’t beat category favourite and Inglorious Basterds star Christoph Waltz — and

so he’s thinking about his reaction when the German’s name is read out at the Oscars.

He tells WENN, “I’m waiting for the losing actor to have the courage to just go ‘F**k!’ when the camera pans on him. If I have the balls you’ll see me do it on March 7.”

But the Invictus star could be a winner at the Oscars if he can look more gracious than pal Stanley Tucci, who is also nominated. He explains, “I emailed Stanley Tucci. We have a contest to see who could look more magnanimous when Christoph Waltz wins!”