Skeptical about those instant remedial etiquette classes being offered for children at fancy venues, Miss Manners now finds that she has something along similar lines to recommend...The instrument in question is the nutcracker. Or, rather, "The Nutcracker." With the proper preparation, it can turn your perfectly healthy modern child into the sort of fetchingly dressed combination of excited enthusiasm and charming nervousness who inspires adults inadvertently thrown in their company to comment, "Awwww" instead of "Ewwww."