5. Never criticize your ex- employers: Remember that the world is a small place where there is 99 percent chance that your prospective employer may know your former employer. Moreover, if you criticize about your former boss during the job interview, the interviewer might think that you are having a habit of badmouthing others and that you might also criticize about them to a third party in the near future. Even if you had a bad relationship with your former boss never show your grudge to your potential employer. Instead, you should show that you are a safe and respectful employee.