Now That's Bombing
I just saw Eddie Murphy interviewed on Inside The Actors Studio. Asked if he'd return to stand-up, he said it'd be tough to go back to ground zero.
Yes, it would be tough, since "ground zero" means the area where the explosion takes place. I think Eddie meant it'd be tough to go back to square one. (Come to think of it, it would be tough to go back to ground zero.)
Actually, I've heard this meaning attached to "ground zero" so often, I think it may now be correct.