Bo Derek and her date -- John Corbett, of "Northern Exposure" and "Sex and the City" fame -- had gotten up from their table at last night's White House correspondents dinner at the Hilton Washington when they set eyes on one suddenly popular young man in a crowd studded with movie stars, comedians and political leaders (and even television's "Bachelorette," Trista Rehn). The young man in question was Lance Vandaniker. He's 23 years old, hails from Sevierville, Tenn., and he'd never been in a room filled with famous people before. He also happened to have his left arm encased in...