How do I break a broody hen?

[irf1983]

All she does is sit in the nesting box, usually on a ping pong ball but sometimes on others eggs.

 

[BarkerChickens]

I've heard putting the broody in a cage with a wire floor will break her broodiness because it makes her tummy area too cold. I have yet to try this, as I have my first broody in the coop right now. I think I will be trying this myself very soon!