Ladies and Gentlemen, meet John Revolta, an Adorable-but-Confused Youngster who made the scene at 7th and Montana this morning intent on treating Our Favorite Starbucks like Studio 54. "Look at me, everyone," he shrieked, "I'm shaking my booty!" He gyrated and jumped his way to the Espresso Bar, then tipped his bike helmet in my direction. "What's his problem?," asked an Anonymous Regular at a nearby table. "Nothing serious," I said, "Just a bad case of Saturday Night Fever ...!"