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Why Sandra Bullock is plotting revenge on George Clooney

10 October 2013 Last updated at 21:53 BST

Sandra Bullock has been on the red carpet in London to promote her latest film, Gravity.

It is being shown as part of the London Film Festival ahead of its general release next month.

She spoke to the BBC's Wendy Hurrell about her co-star George Clooney, who once played a prank on her.

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