The 49-year-old actress and Clooney tried to learn the lyrics to the Sugarhill Gang classic 'Rapper's Delight', Bullock said on Live with Kelly and Michael.
The longtime friends would compete to see who could remember the most of the lyrics, she added.
"I've got to give it to him. There's a couple words -- the bridges -- that I chose not to learn. I'll give it to George. George has about 98 per cent of that song down, in the eight minute version."
"We were pretty much separated at birth," she said of her costar.
'Gravity', which is already creating Oscar buzz for Bullock, revolves around two astronauts in space who find themselves floating above earth after an accidental explosion completely cuts off their communication.
"It's really about this emotional ride that you are allowed to step on. And whatever's happened in your life, you experience that and think about, 'What would I do?' And hopefully by the time you get out of the theater, you go, 'I'm going to change my life. I'm going to change and do the things I always said, 'Maybe one day.' Don't 'maybe one day' it. Life is short, things happen. Do it now.
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