WSJ -- With so much competition for every job listing out there—there are more than 6.1 job seekers for every job opening, according to the latest job-opening and turnover data from the U.S. Department of Labor—wowing a recruiter during a job interview is even more crucial. According to a new survey of nearly 500 human-resources professionals released by the Society for Human Resource Management, there are plenty of ways to derail a job interview—and some of them may surprise you.