It's my timey-whimey detector. Goes "bing" when there's stuff. Also, it can boil and egg at thirty paces.
Thank you to the following Anons:
WintersFrozenThorn
Fluffeh Fat Bat
Winter Prince
The Observer
Silly Sender
Cutey Cupcake
Whether you want it to or not actually. I've learned to stay away from hens. It's not pretty when they blow.