Dead Air by Iain Banks

A couple of ice cubes, first, then the apple that really started it all. A loft apartment in London's East End; cool but doomed, demolition and redevelopment slated for the following week. Ken Nott, devoutly contrarian leftish shock-jock attending a mid-week wedding lunch, starts dropping stuff off the roof towards the deserted car park a hundred feet below. Other guests join in and soon half the contents of the flat are following the fruit towards the pitted tarmac... just as mobiles start to ring, and the apartment's remaining TV is turned on, because apparently a plane has crashed into the World Trade Center...