Emergency

One day when I was dropping Emma off, her teacher informed me that they would be testing the emergency alarm that morning. When I picked her up, I asked her about it.
Amy: Did the loud sound go off today?
Emma: Yes, the emergency alarm went off.
Amy: But it was just for practice, right?
Emma: No, (wide-eyed) there was a real emergency!
Amy: There was? What was it?
Emma: Somebody had a loose tooth!

She absolutely insists that this is the reason the alarm sounded!