While most people hid inside during yesterday's deep freeze, the few who chanced the icy sidewalk of the Overlea bridge near Don Mills Road received a little smile if they happened to look down: some overly cheerful person had stomped out a big happy face between the cross-country ski tracks in the Don Valley 30 metres below the bridge. Although we can't condone overt cheerfulness—especially when the wind chill is minus a jillion—we'll admit......