When We Don't Know Something

What do we do when somebody hits us with a question whose answer doesn't immediately occur to us?

H. Cain looks upward for far longer than a man supposedly with all the solutions should. As he is a man of God, being an associate minister in one of those monster, megachurches, maybe he and his God have worked out things so that the Great Almighty writes out the answers for him on the clouds. R. Perry grins and tries to come out with something humorous to say. S. Palin consults the palms of her hands.

I wonder how I would react in that situation? The best that I can guess is that I would probably answer with a stare that clearly questions my questioner's sanity. In other words, look at them like they were crazy, while waiting for them to come to their senses. Ha!