Even if you could dig through to the other side of the world, and assuming the molten core wouldn't incinerate you, would you really be able to go through to the other side? Think of it this way: gravity holds us to the ground, and down farther as we go. But once you get to the center, would gravity neutralize/reverse so you don't go in either direction? I don't get it.

Discuss, that is, if your minds haven't shortcircuited from thinking about it.