It was time for Little Johnny to hand in his homework, so he gave his teacher a blank piece of paper.
The teacher looked at the blank piece of paper and said “What is this?”
Little Johnny replied “Please Miss, it’s a drawing of a cow eating grass”
The teacher looked at the piece of paper and said to Johnny “Where’s the grass then?”
Little Johnny replied “The cow ate all of it Miss”.
The teacher looked at the paper again and asked him “where’s the cow then?”
Without hesitation, Little Johnny replied, “It left Miss, because there was no more grass”.
Image used under a Collective Commons License from https://pixabay.com/photos/paper-blank-white-empty-page-2221812/