[valarauca1]

I'd walk out, as a developer, I'd likely laugh too. Well I'd laugh, then see you were serious and walk out.

You want me to code fast, I'll code fast. My code will be shit, but it'll work. It won't scale, it'll roll over and die in 3 months when we make the slightest change.

As an interviewer its idiotic. What are you testing? If I've memorized the question you're asking me? Or seeing how fast I can think on my feet. If its the former, what? If its the later, there are other ways to test this, that make sense.

If you want to see how a developer thinks on his feet, give both of you a problem you haven't seen before, prototype a data structure to solve this problem. Work together interviewer and developer, you'll learn each other's thought process, and a bit about the company dynamic. It'll take longer, but more information is gained via osmosis.