I would tend to agree with the folks who don't like to ask these kind of questions in interviews.
I think the first thing you've accomplished by asking these types of questions is to reduce your potential hire pool to only those who are able to answer questions under pressure.
I had an interview several years ago at a place where they required you to take the online brainbrench test. When I went to visit them they seemed to be very happy they were hardcore geeks. They seemed to want to put me on the spot. I kind of gave up answering their questions. Their office was out in the middle of nowhere. And after a while I was like, do I want to drive all this way for this?
I am now responsible for a group of programmers, and we are looking to hire. A large percentage of the resumes I have seen include some experience at that place.
I guess what I'm trying to say is that asking the type of questions you're hoping to ask don't have any bearing on wether the interviewee would be a good fit for the position.
I think getting a feel for their personality and questioning them on a situation that you've encountered in your daily worklife would be a much better judge of how they fit.
>>>>So, why are manhole covers round?
>>>
>>>To prevent the manhole cover from falling into the manhole.
>>>
>>>Einar
>>
>>And because manholes are round.
>>
>
>LMAO Yes. I think I would accept that answer as a "correct" answer as long as the interviewee laughed after saying that. Bonus points if (s)he after laughing gave me the answer I was looking for.
(On an infant's shirt): Already smarter than Bush