LOS ANGELES -- "Ice Age: The Meltdown" heated up the box office with a mammoth $70.5 million weekend, while audiences gave the cold shoulder to Sharon Stone, whose "Basic Instinct 2" debuted with a paltry $3.2 million. "No one had any idea it would do this kind of business," said box office analyst Paul Dergarabedian of Exhibitor Relations, who expected the "Ice Age" sequel to debut in the $55 million range. "The notion that people don't want to go to the movies is dispelled by something like this," he said. "It proves people will line up for the right movie...