On the coffee, we had the coffee wars, and that was when I bought a one of those cup and funnel sets for making one cup at a time and supplied all my own stuff.
I did the same thing at my all-time worst job. We shared the facilities with the Sales group, the coffee pots were supplied, but not the coffee. The Sales guys all chipped in and bought their own coffee and supplies. No one else in my group drank coffee (or bought it outside), so I brought in my own Melitta set and coffee. Cue one of the sales guys popping up in the break room and saying, "Wow, that coffee sure smells good. Can I have some?"
I replied, "No, this is coffee I brought from home."
He then started to argue that I if I drank their coffee and I should share some of mine. I told him I didn't drink theirs which was why I brought my own. He then started saying how selfish I was to make my own coffee and not contribute to their coffee fund (which I had pointed out I didn't participate in). As he got louder and louder, I ignored him, finished my coffee-making and walked away from him in mid-bray. To this day, I cannot even begin to understand his vehement reaction to someone making coffee for themself, using their own supplies.
Office refrigerators are their own special beast. I gave up after someone literally threw their lunch, in a manila envelope, no less, on top of a specially decorated cake in the office fridge. Yes, there was plenty of room on other shelves in the fridge for the manila envelope lunch. I have a whole wardrobe of insulated lunch boxes and little blue ice packs.
Lastly, similar to the tomato soup story shared by a PP, at the aforementioned awful place to work, I opened the microwave one day to heat my lunch and there was a large puddle of soup. I groaned, "Oh man, who spilled their soup?" An indignant, disembodied voice floated over the cube farm, "I did so clean it up!" I looked closer and they had taken a paper towel and made one swipe, leaving a clean trail in the puddle of soup. Yep, that's cleaning up I guess. I was never so happy to leave that place, let me tell you.