Earthquake
We had an Earthquake just before. Out of nowhere the whole place just SHOOK for a second. That was all, just a single second, but far out it scared the crap outta me. I don't want to die in a collapsed office block, I mean that would really just suck the big one.
I heard what I thought was a massive truck going down the street about a second before it hit, I don't know if it was related but I guess it probably was. Not cool, Earth, not cool.
Tim