The big event on Washington's Mount Baker every Fourth of July is the Slush Cup—a hybrid sport inspired by the pools of melted snow that gather on the ski runs. Dozens of Slush Cuppers schuss down the slopes, hit the icy water and hope momentum will carry them across. It seldom does. Some, like the sleek miss at left, emerge from their ducking in a statuesque pose. Others, like the skier coming in for a three-point landing (center), go down fighting. A few arrive (right) upside down and airborne. So far, no one ever has broken a leg, drowned or frozen to death.