This week on David Letterman was Close-Up Magic Week. Steve Cohen has a regular weekend gig doing his sleight-of-hand magic at the prestigious Waldorf-Astoria here in New York City. He gets a suite and everything. Wow! Talk about a magic trick! Mr. Cohen, the Millionaires' Magician and a former Tannen's Magic Camper, asks for a ring from Paul Shaffer...check out this "hat trick" of an effect...