There's a colleague with whom I'm working very closely, and whenever we're having a coffee after lunch or after / in between meetings, he'll buy the pastries and I'll buy the coffee. So today I got to take care of the Kwanzaa / Cup of Unity task:
(Task: Cup of Unity is another Kwanzaa symbol. Either buy a friend a coffee / tea / etc. or start a small tab ($10 or less) at a local coffee shop and buy a coffee / tea for strangers behind you in line.)