I work in a small department (10 people) at a larger office (100ish people). Our department (OD) is a far corner of the building and surrounded by a large buffer zone between us and other departments. Basically, the only time non-OD staff are in our area is if they make a specific trip here, and that is next to never.
Well OD decided to all bring homemade treats to share for halloween. Everyone brought something, and the amount was enough for OD plus a little extra for people to take home to share with our families.
I guess non-OD people saw us carry in our treats because less than an hour later, Pam from department Z shows up because "I heard you had goodies." She proceeds to fix herself a big plate without asking. She also mentions that someone in department A brought cake and she was going to get some of that too.
We would never consider helping ourselves to treats from other departments. A few other non-OD people came by and helped themselves as well after Pam shared news of our snacks, meaning we had no extras to share with our families like we planned.
We were pretty miffed that people came by and took a bunch off food uninvited, without contributing. Would this bother you or should we have anticipated treat-seekers from other departments?