When I put a fat cap on a can of black, and I make my first line on a giant chrome, I get really excited, even after all these years... Why should I though? its a can of paint and the label says "black". Now if dollar bills came shooting out of the can, I can see getting excited, But black paint? Why get excited? thats what a can of black paint is supposed to do...
Now can you see why the kid was excited about watching his kite fly? Its because exciting activities never get old.
*(and at least he wasnt at the park with his nose buried in a video game like so many little shitheads these days.)