17,600

Between 2002 and 2010, according to the March BJU International (formerly British Journal of Urology), an estimated 17,600 patients came to U.S. hospital emergency rooms reporting genital injuries from trouser zippers (presumably by accident, but researchers took no position on that). Seven authors (six from University of California, San Francisco) took credit for the report, funded by a National Institutes of Health grant, and found that "zip" wounds were only about one-fifth of emergency penile injuries.