I attended an information session on campus and they stated they still had a few interview slots open the next day and that if you were interested to leave your resume with them and they would call you that night. I didn't have my resume with me but I waited in the long line of students afterwards to talk to the recruiter who said I should email my resume to him within the hour, if possible. I did, he called me back an hour after that to offer me the interview. In the interview he asked a lot of questions I wasn't expecting. In retrospect the interview questions seemed to be asked in such a way as to gage my behavior and reaction to the questions but I remember leaving the interview feeling horrible because it felt like I had to come up with answers on the spot for every question (and because my interviewer hardly smiled at all!) But I did much better than I thought because I was offered the internship after all and became friends with my recruiter. I advise interviewees to be honest and don't panic if you don't know how to answer a question right away, just take a few brief moments to think it over and you should be alright.