The most difficult questions include one that asked why I want this job, which broke down into one asking if I wanted to keep pursuing a career of researching (which I have done so far) and the other asking my work experiences wouldn't be so different from a job I might get to do if I got an offer from this company. And the most embarrassing moment was where all applicants were asked to introduce themselves and they were acting on their "pickup lines", which were really awkward for all of us, including interviewers.