THE BIRDS!!!

This has happened once before that I can remember.  I'm sitting in the condo, working on something super important, I'm sure, when I realize that there is this noise coming from outside. And when I look, it is hundreds of birds in the trees across the way. And they make noise!  Then they all flew away. It reminds me of Hitchcock's The Birds movie.  A little spooky. Not sure what they are- perhaps grackles?