I talked to a recruiter at a career fair and we didn't really seem to hit it off real well, walked away thinking I wouldn't be hearing from them again. The next week I get a call from a recruiter asking to schedule an interview the following week. I accepted to interview.
The two people I interviewed with were very friendly and in the field I would've been working in. They asked about five questions and none of the questions were extremely technical, but they did like it when you were able to reference different kinds of methodologies you know or skills that you have.
I walked out of the interview feeling good, and I received a call the next morning with an informal offer.