Smartness

On the way home this evening:

N: Mommy. O-P-E-N spells open, right?
Me: Right.
N: So N-E-P-O spells closed!

Edited to add: Hmm. No gasps of delight from the readership, no assertions that my child is a freaking genius. I must do something about this! Did I mention that he's 4? And that there were no signs nearby, so he not only did that little ingenious thing with assuming that a word's opposite would simply be that word spelled backwards, but he spelled 'open' backwards just in his head? He's brilliant, people! I'm telling you!