Maybe not that, but "What keeps you up at night?" - obviously not asking about scary movies or a noisy neighbor, but about issues within the organization. I have found that this way of asking the question (as opposed to "What are the biggest problems?") seems pretty disarming and I've heard prospective employers divulge more than they probably originally wanted to.

Warning: Excessive exposure to Big Macs may cause a fat ass.

Absolutely. Remember, a lot of people struggle with pushing the "Retrieve emails" button, and some can't even differentiate between the "Reply" and "Reply to all" buttons.