I think expecting people to know things they really shouldn't, and seeing how they react to that lack of knowledge is a very important part of interviewing. I

I think expecting people to know things they really shouldn't, and seeing how they react to that lack of knowledge is a very important part of interviewing. I assume this isn't the only question OP asks in their interviews, but I think it's got a couple of good outcomes and returns a lot for the length of time it takes to go through.