I just had my first hen go "broody." I have to tell you, I can see how it would be pretty annoying, but I thought it was awfully funny. The first thing I noticed was that she was behaving oddly for several days. She would do what I called a "turkey impression."
If you have ever seen a tom turkey puff himself up to impress the ladies, that's pretty much what Ethel did. She fluffed out all of her feathers, cocked her tail up and fanned out her tail feathers, and wandered around mumbling "tuk tuk tuk" under her breath.