You're armed with your resume, cover letter, and portfolio ready to ace your job interview, so what could go wrong? Preparation is key to a successful interview. Not only should you be prepared to show off your skills, but you should be prepared to answer any of the questions that your interviewer throws your way. Many times these seem like curveballs designed to trick or trap you. But keep in mind that the hiring manager's difficult questions are helping him or her to understand your past experiences and how they have made you a stronger professional. To help you in your interview quest, we have outlined some of the most difficult questions you could face at an interview and how to best answer them.