My only project for the day was setting a post for my mailbox. No big deal, right? The six inches of limestone that was three inches under the surface was a little tough. Luckily I have enough air hose to get to the road, and unleashed the 'ol Matco air hammer on Mr. Limestone. I win.
Now that sounds like a kewl toy to have... I would be stuck with a sledge and cold chisel.