Your biggest non-technical hack/discovery
fogus: I once worked at a car wash were most of the employees were out on work release.  Anyway, the days were long and boring so I took the time to devise a way to get free sodas out of the vending machine.  I was not interested in stealing soda, as I hated it, but only in figuring out how to do so.  I eventually did so.  I was so proud of myself that I decided to show one of the guys that I got along with pretty well.  When I came back few days later the machine was completely empty and was never again able to provide tasty beverages for very long. Eventually the owner of the machine caught on and removed it from our site.  I was very naive.