When a new child visited our Sunday school, the teacher greeted him and asked the little lad, “How old are you?”
The little boy held up four fingers.
“Oh, you are four”, the teacher said.
Making conversation with the boy, the teacher then asked him, “When will you be five?”
The child stared at her, and then after a few seconds replied, “When I hold up the other finger.”
Image used under a Collective Commons License from: https://www.flickr.com/photos/cmcbrien/5406245416