So I was in Bodega Bay yesterday...
And I was hiking around Bodega Head, birdwatching away, when I noticed that two tiny little bluebirds were repeatedly attacking an empty parked car. They kept flying at the windows and pecking at them, circling around the car to look for more vulnerable points, and they were still at it when I wandered away fifteen minutes later.
I tell you, it was like a deleted scene from "The Birds"! One that was left on the cutting room floor because it was silly.