Managing multiple egos, in an office or social setting. Trying to track all of the body language, what is said, who is making eye contact with each other, who is looking out the window when a person at the meeting is talking, etc in a work meeting, for example, is difficult.
It's hard to attend to all of that, while also remembering all the stuff each person said or did outside of the meeting, that contradicts what they say or how they act while "onstage" in the meeting. Since nearly everyone there was lying about or misrepresenting something, or despised at least one person there who they were pretending to get along with, those associative memories were intrusive. And then I had to remember not to bring those things up, even indirectly.
And of course, someone always thought it was a good idea for me to record the meeting minutes (take notes and distribute). They never thought that for long, though. I would doodle through the whole meeting and then send out an email with my best recollection of what had happened in it. And then someone else would be assigned to take the minutes. 