Matt Damon's politics owe a great deal to his mother. The first time Nancy Carlsson-Paige saw her son featured in a glossy magazine, she was appalled. "My beautiful boy is being used to sell products," she told a newspaper. "He is just a cog in the capitalist system." She'd never even read a magazine like Vanity Fair before, her son explains. "She's a professor. If it's not the Nation, she doesn't read it. And she said, 'This thing is nothing but page after page of adverts for products that nobody needs!'" He chuckles. I'd love to know what his mother makes of his latest film, Elysium, a big-budget sci-fi action thriller packed with set-piece fights and expensive pyrotechnic violence. "Hmm, well, my mom's big on non-violent conflict resolution," he grins.