in college a crow took a dislike of me for some reason - I swear I never and would never intentionally harm a crow, and I never understood why - and would dive at the back of my head cawing very loudly if I cut through a certain parking lot where it hung out. It never like, actually attacked or even pooped at me that I can recall but it remains an extraordinarily unpleasant experience and I endorse going out of your way to stay on the good side of the local corvids
Also it definitely told its friends because this started to spread just before I graduated