Job Interview 2.0: With those stupid Riddles
thedailywtf.com
thedailywtf.com
It's a good proxy for IQ, which they can no longer legally test, but which correlates very strongly with job performance in a variety of tasks.
They may want to see how broadly you can apply information (e.g. if I were asking someone a finance question, I would not ask them to talk about stock options -- I'd ask them to talk about trading water rights, or valuing nonsmoking sections in a restaurant).