[EvanKelly]

I've eaten/drank parts of co-workers lunches unwittingly thinking they were part of the community food/beverage selection.

I never got reprimanded, but I did have to sheepishly explain to a coworker that I drank his soda thinking it was one of the community ones since it was in the door of the fridge and unmarked.

I now work at a company with an extensive free kitchen and you have to do an extremely good job of marking your personal food since the default assumption will now be that the food is everyones.