As a response, I've started a project where I code out the answers to all of these silly "can you code" questions that pop up. I've been able to use it in several interviews, and it's thrown the interviewer for a loop (they still insist I write it out as if I'd go to all the trouble to fake a GitHub repo to avoid writing five lines).

You can find the repo here: https://github.com/SomeKittens/Interview