Ask HN: Instructions in job descriptions?

So I'm looking for a Flash game developer in Montreal (http://bit.ly/pY1jt1) but I want to make sure that I only spend my time on people who are fun and really into their work. So I stuck a simple question at the end of the job: If your goal was to break into a bank with a giant robot, what two weapons would you equip as its arms?​

Almost nobody who replied bothered answering the question! I can appreciate that it's a hassle to write a long, well thought-out cover letter, but am I being too picky here?