Oh, it's just an Earthquake

So today I was sitting at work. At about 3 pm the floor shook a bit. It was barely noticeable, but I looked around. No one else seemed concerned to I thought I had imagined it.

Then, one of the men in the meeting going on at our center table stops and goes "Oh, an earthquake." They all nod and go back to work.

Oh, just an earthquake. That's like saying "Oh, just a tornado."
Crazy.