So throwing good sense completely out the window, we got a longer piece of rebar, drilled the hole much deeper in the end, and packed a whole lot of match heads into it. When that rebar hit the concrete, it went off with a loud whack, and the rebar, which we could normally track as it left the tube, left our location for parts unknown, and none of us having a clue where. That wasn't the worst of it, for the bolt that was in the end of the rebar was now stuck deeply into the driveway, and the concrete had a spiderweb pattern of cracks radiating away from the impact point.