First or second week of my first job (internship) and my manager mentions that upper management has decided that a couple of engineers are being reassigned to the new technical writing team, myself included, effective tomorrow with no prior warning, before dragging us into a tech-writing standup.

A couple of hours later my manager apologizes to me for forgetting to tell me about this and asked how I felt about this. I basically answered "not well, this isn't what I signed up for", and credit to him, he pulled enough strings to get me out of that team and back to my actual job. In hindsight I suspect that it was more due to the fact that this internship was a three-way contract with the university and that if I complained they might get their intern supply cut off.