Just Checking

I was cleaning up the lunch dishes, standing at the sink, when Crackerjack came up to me, holding his hands out and looking them all over. He said to me:

"How many fingers are you supposed to have?"

Laughing a little (but not too much, I could see he was serious), I answered him:

"Ten! Or, eight I guess. Eight fingers and two thumbs."

He continued to turn his hands over and over, obviously counting and re-counting, so I turned off the faucet and asked:

"Why?"

Holding up his hands and wiggling all his fingers, CJ replied:

"Oh, I'm just checking, it was looking there like maybe I was missing one."