It starts on Saturday morning before Thanksgiving, typically a chilly day, and you can hear it before you see it. First the cheers, then the chants, then the songs. And then they sprint, loudly, more than 185 girls, half in red and brown, half in green and white, past Carter House, across the lawn, headed for the rectangle of asphalt in the middle of campus, parents and siblings straggling behind with mugs of coffee and hot chocolate. The Brownie- Spider basketball game is about to begin.