...Possibly due to being pissed off about being rained on.
This is the common Grackle, looking quite a bit less iridescent than they can do thanks to it being grey and wet. If you see a thing that looks like a crow but is smaller and gives off the distinct impression of giving you The Eyeball, that's one of these.
Canon R10, ƒ/14, 1/640, ISO-1600, 400mm. I stepped up the exposure compensation a bit but maybe could have done with a little more. Oh well.
Bonus picture of this guy reevaluating his life choices:
