One thing that's confused me about the "Please tell us about the time you most successfully hacked some (non-computer) system to your advantage." question is the parenthesis. My guess is that they're included because you'll accept either a computer, or non-computer related example. If it's confused me, chances are it may confuse others as well.
That seems to exclude hacks to computerized systems such as "Profited from eTrade being slow to patch the mutual fund market timing loopholes" or "Flipped laptops on eBay when lots of people used to spell it labtop."