@Fa5t3r - That doesn't surprise me, really. Children are natural performers, and even though we like to think of them as not being self-conscious, I can remember being very aware of an audience when I was a kid, even when there wasn't one!
It's part of learning how to fit into communities. If you aren't aware of the reactions of people to your actions or your speech, then you aren't going to learn which things are considered good and which are considered bad.
Also, when it comes to metaphors and things, kids have the imagination to really get into the heart of description. I bet in some ways they are better than adults in deciding what to put in their speeches and other writing, even if they can't quite get it out as well as an adult might.