(Cover) - EN Showbiz - Matt Damon says George Clooney is "very tough" to play a prank on because he's a "pro".

George is famed for his on-set practical jokes and regularly fools his co-stars. Matt has never been able to play the Hollywood hunk at his own game because he's too much of a seasoned professional at it.

"I've never gotten George, no. The thing is, George is a pro. He's very tough to get," he told Shortlist magazine. "He's got them all down. He's very, very funny."

Matt is glad Brad Pitt managed to get George back though. The American actor has recalled the funniest prank he saw on the set of Ocean's 12, which he, George and Brad all co-starred in.

George plays gang leader Danny Ocean, which Brad used to his advantage when setting up the joke.

"The best one I saw on George was on Ocean's 12 when Brad [Pitt] had a fake memo translated and given to the Italian crew. It was this whole thing saying, Please do not look Mr. Clooney in the eye, only refer to him as Mr. Ocean or Danny.' It was so the opposite of George that he was mortified and when he found out, he was not happy about it," he smiled.

"So that was the one time I saw someone get him."

Matt is currently starring in the Steven Soderbergh-directed Contagian. He hopes to overtake George and become the filmmaker's favourite actor to work with.

"We're tied at six," he said of his and George's collaborations with Steven.

"But I'm going to win that's all I'm saying. We each have another one lined up with Steve and then I'm hoping that I can sneak in as an extra into the one he directs after that," he laughed.

"I told Steven that it really matters to me. I want the title. I really want it." (C) Cover Media