It's impolite to steal people's stuff, and ultimately, they're not really responsible if what you're stealing isn't what you thought you were stealing. Besides, when you're taking things without asking, there isn't really a chance for the person you're stealing from to tell you what it is that you're stealing from them. Having food going missing from the workplace fridge is an all-too-common office frustration, driving some to go to considerable lengths in order to secure their food in the frid…