Also place marking.
We used to have fridge wars.
Fridges on each office floor were for milk only (bought by company) and the fridges in the canteen were for lunches etc.
Of course most of the lazy bastards couldn't be bothered to walk across to the canteen and either remove the mill from the fridge or it just got left on the side going sour.
Despite repeated requests it didn't change until one person got fed up, took all the lunches out and left them to swat on the windowsill and filled the fridges with the milk.
Well, there was outrage! It wasn't me but I wish it had been.
Don't get me started on heating wars, walking away from the printer when it was jammed/ out of paper etc. Why are there so many entitled people in the world?
Good luck op.