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The Michael Clayton star admitted that he was "much harder to live with" since he won the Best Supporting Actor gong at the 2006 Oscars for his role in Syriana.
He told GMTV: "That's what I enjoy doing with Brad - is gloating.
"I keep [the Oscar] back over a fireplace in my house. When my friends come over, I make them pick it up and we take photographs of them giving an acceptance speech!"
Talking about his new movie Leatherheads, Clooney said he felt under added pressure to create a box office hit because the film stars his long-term pal Renée Zellweger.
"We've been very good friends for about 12 years, so there seems to be more of a responsibility - you don't want to screw it up when they're good friends of yours," said Clooney. "You don't care if they're not good friends."
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