In his 25 seconds animated clip called "The Grackles", Monte Bach of San Antonio Express-News illustrates for us exactly the thing we fear most from large, evil-looking birds a la Alfred Hitchcock's classic horror film The Birds.
Link [Flash video] | His other animations [Flash], perfect for Halloween - Thanks Rich Marini and Mike Howell!
At the end, you ask yourself, "That was it?"
Actually, I was just expecting more than that. It was very brief. Maybe it's just too old a joke for me.