I spontaneously bought donuts for two of my coworkers today, to congratulate them on sending out a mailing, and thank them for their hard work on said mailing (which I also worked on). One of the two coworkers (ENFJ 3w2) is at my level, and the other coworker (INFJ 6w7) is one of my two supervisees.
In my typical endearingly, self-deprecatingly, and played-up-for-humor awkward fashion, I stopped by their offices individually, knocked on the door, quickly handed them a donut, said "To celebrate the completed mailing. That is all.", and then ran away.
What made me happy today: The thank-you email that my INFJ supervisee sent me, which contained the best possible picture for the situation.