Legs Up!

The other night when I went to change Clark's diaper, I noticed that when I undid his diaper tabs, he would immediately put his legs up. It seems our little guy has figured out that whenever he hears that noise, I put his legs up to change his diaper. He now preempts me. He usually smiles when he does it too, as if to say 'beat ya mom! I know what you are up to'. It makes me wonder what else he has figured out that we are unaware of...