I see three problems with this: 1. It would pretty difficult to judge whether you are correct or not 2. This approach favors candidates with a flair for speaki

I see three problems with this: 1. It would pretty difficult to judge whether you are correct or not 2. This approach favors candidates with a flair for speaking but may not have good programming ability 3. The interviewer would probably run out of concepts that he can reasonably expect the interviewee to explain.