Don't ever mess with crows. Why? Because apart from just being incredibly intelligent, the corvids will remember your face for the rest of their life, and they and their friends will attack any time they ever see you.
In a scene that's equal parts Hitchcock and Assault on Precinct 13, aggressive, territorial crows near an Everett, Washington police station have singled out officers for divebomb attacks. How come? The antsy crows are defending their newly airborne chicks.