Anyone with a 5 year old (from an English speaking country anyway) probably knows the joke. Let me fill the rest of you in.

The teacher say, "can anyone use the word 'geometry' in a sentence?".
One little boy raises his hand and says, "The little acorn grew and grew. Then one day said 'Gee, I'm a tree'"

ROTFLOL. (okay, not really that funny. But when your kid tells it to you, you better laugh like it's the first time you've heard it)