At the end of his life, inventor, aviator and Hollywood horn dog Howard Hughes collected his urine and nail clippings in jars. Before he slipped into OCD-land, Mr. Hughes collected cars. His last set of wheels— a 1954 Buick Roadmaster sedan— goes under the hammer at Barrett-Jackson's Palm Beach auction, April 1 - 3. The pastel blue land yacht (with seafoam green top) was customized to Hughes' "eccentric demands". In other words, the rear compartment was hermetically sealed and cooled by a 24-volt bacteria-trapping A/C system. Why 24-volt? To jump-start airplanes, of course.