This seems to be related to the topic, but if not, please move to appropriate forum:
Please do not forget to take home the food you left in the refrigerator. After a few weeks of different people leaving their food in the refrigerator, space becomes a major issue. As well as the fact that self-mobile plastic containers freak people out. On the other side of this, do not freak out when the maintenace guy throws away all of your lunch containers when he is cleaning out the refrigerator. In many offices, an email is sent or a sign is posted that states that the refrigerators will be cleaned out at X time on Y date.
Also, if you do bring your lunch, please bring it one day at a time. Just because you got a month's worth of frozen lunches on sale does not mean that all of them should be stored in the freezer at work. Other people would like to have a few inches of space.
If you use the dishes that are available in the office cabinets, please wash them promptly after each use. If you bring your own dishes, please do the same. It is not fair for the maintenance people to have to do your nasty dishes or for your co-workers to have to look at your remains while they attempt to wash their dishes. A cup that you used for water does not need to sit in the sink "soaking" for hours or days after you used it.
Clean up after yourself in the kitchen/break room. If you heat your lunch up in the microwave, wipe up any spills or splatter. Pick up any napkins, stirrers, etc. that you use when making your coffee.
If you take the last of the coffee, please start a new pot if it's early enough that others will drink it.
Please do not use all of the ice to fill up your gallon sized water jug every morning. Other people would like ice for their drinks as well.