For the most part, we expect that we can't go wrong by going above and beyond what's expected of us at our jobs.
Whether we see any reward for our drive or our clever ideas, there's at least an understanding that our bosses will look upon us favorably after we make things easier for them. Of course, there's another school of thought that doing this just ensures that we get extra duties whether we want them or not so it's best to just stick to what's specifically considered "your job" and nothing more.
But while some may balk at this kind of work ethic, one Best Buy worker may have recently learned that in some situations, it's the best way to make sure you stay employed.