"There's a wonderful sense of camraderie among skydivers," Mr. Ottley said. "It's like a secret fraternity." Initiates speak easily of "swooping" (joining a formation) and "funneling" (breaking one up). Outsiders are called "whuffos" -- shorthand for "What for you do that crazy stuff?" "You can always tell a whuffo right away," Mr. Ottley said. "They call the sport 'diving' instead of 'skydiving.' We think diving is what you do in a pool."