I know it seems petty but I am unreasonable to get annoyed at this behaviour? We get milk delivered a couple of times week (paid for by the company). Without fail my boss will finish off the last pint making a frothy cappuccino when they arrive leaving the rest without - the amount of milk would last the rest of the office the rest of the working day. I just think its really rude when they could make an americano style one with less milk or a tea and leave some for others before someone can go to the shop. First world problems I know I should just let it go