Y'all may laugh at me - or swear at my ignorance - but when I saw the subject line, I immediately thought of my broody hen setting on her 3 eggs and a golf ball. I thought, wow, must be some bantam breed, to have a hen setting on a BUTTON; I thought the OP was making a joke. After all, another thread listed a silkie who was "brooding" a small Tupperware container.
So, forgive me for side-tracking the thread. The subject line lured me in, and then I had to say why.