That Norwegian Trygve Bauge left some strange and cold things behind when he departed for Norway. His grandfather, Bredo Morstoel, is cryogenically frozen and stored in a Tuff Shed in Nederland, which inspired the towns Frozen Dead Guy Days festival. Bauge also founded the Polar Bear Plunge, a chilly dip in the Boulder Reservoir, 5100 North 51st Street, on New Years Day. Which explains why today at 11 a.m., a mass of people some of them garbed in outrageous costumes, some of them in bathing suits, and all of them possibly out of their minds will leap into the ice-cold water. Some will rocket out immediately, shivering violently, while others may languish for a moment or two.