I was cleaning out their coop and brought down a large bag of shavings. It slipped as I was putting it down and hit the ground with a loud thud. My birds went nuts and starting making what I would now call a stereotypical chicken noise, but I had never heard them do it. This went on for about a minute... I finally got out my phone and snapped some video just before they stopped. I have never heard them make this noise, and thought it was just interesting. I'm assuming it was because I scarred them, nor did they didn't like the big bag I was carrying. The first is my rooster, and the high pitched squak is one of the girls just off into the woods behind a bush and then she runs out. The others were out of view... Edited for spelling.