About a couple of hours ago, we hear a big Boom and the windows on the 28th floor rattle a bit. Since the floor was not shaking, everyone ended up at the windows peering out over the bay, wondering if maybe another ship has hit the piers of the bay bridge. Pretty soon a couple of helicopters took to the air over the bridge, and we still couldn't see anything going on.
Watching the helicopter got to be a bit boring, so we went back to work. Now, we get to find out who was responsible: PG&E.