Nope, dont believe it has been invented yet. 🙂
Now think about it, if Hillary should close down the mines, Nationalize em, or any other of half a dozen possibilities, what do you think an ounce above ground might be worth?? Why she might even try to confisicate our ounces. I have no problem with that, as long as they take my pea shooter first. Then I guess she can take whatever she wants.
Rocks, I dont think a 4 yr old can break rocks. Give him a pet rock !