[adamconroy]

In an interview i have never had a problem saying that I don't know something or that I do know about something but can't recall the specific answer.

I normally try and turn that scenario into a quick discussion where I hopefully let the interviewer display their vast knowledge and insight. Assuming the question is relevant I am always geniuenly interested in finding out about something I don't know. Seeing that I am not being paid to take the interview I feel it is only fair that I get something out of it.