Excerpted with permission of the publisher John Wiley & Sons, Inc., from Annoying: The Science of What Bugs Us, by Joe Palca and Flora Lichtman. Copyright © 2011 by Joe Palca and Flora Lichtman. This book is available at all bookstores, online booksellers and the Wiley Web site at www.wiley.com, or call 1-800-225-5945.