An exuberant bath.
With the dictating membrane protecting one eye it reminds me of a pirate with an eye patch.
Common Grackles are resourceful foragers. They sometimes follow plows to catch invertebrates and mice, wade into water to catch small fish, pick leeches off the legs of turtles, steal worms from American Robins, raid nests, and kill and eat adult birds.
The oldest recorded Common Grackle was a male, and at least 23 years old when he was killed by a raptor in Minnesota.
source - https://www.allaboutbirds.org/guide/Common_Grackle/