Same here, sans rifle.Dang, I was hoping for some real insight here, as my Orpington's do this all the time. Been thinking it's egg related, but whether it's them upset about needing to lay an egg, upset about where they're going to lay an egg, upset that an egg they've laid has gone missing, or just generally being upset at the world, I have no idea.
When they first started doing it I'd come tumbling out of the house rifle in hand, looking for whatever it was that had my hen in it's jaws, to find no gruesome scene, just a hen complaining about the state of things and the unfairness of the world.