I couldn't explain that it's complicated, that darkness can seep into anywhere, blotting out light. It can happen anytime, anywhere, to any of us. If my mother had said that to me at his age, I would have gotten in bed and pulled the covers over my head. It all would have seemed horrifyingly pointless.
As we got closer and closer, the dark cloud seemed to lower itself closer and closer toward us. I slowed down. My life was flashing before my eyes. A few black birds that looked an awful lot like bats swooped low and close to my windshield and I wondered if this was the same sort of symbol as a black cat crossing your path? Seemed about right.
My son and daughter are both grown up now, successful adults with jobs and lives of their own. I suspect the reason I have kept their old teeth all these years is that every night the Tooth Fairy paid my kids a visit wasn't only a magical experience. For them, it was also a practical learning experience.