Also keep on hand some special cups for when you serve coffee to your visitors. I don't think we ever remove anything from the refrigerator at work. One day when I couldn't find room for my lunch bag in it, I started pitching things. I tossed everything that was past the 'use by' date on the label. The refrigerator was almost empty by the time I got done.
Some companies have a policy of tossing all foods left in the refrigerator, once a week.
They may even have a sign on the refrigerator so no one is caught unaware. And then they put their hands in the popcorn bowl in the break room. Many local health departments have posters you can use. If you'd like to make your own poster, here's an idea adapted from Purdue University Cooperative Extension Service. Draw an outline of your hands with the 10 fingers and thumbs spread apart.