Student Stories: that CRAZY baby...

I teach a wide range of age starting with 6 month olds (I only have one). This is a story of one of my babies. He's about a year and a half old and he is CRAZY. He climbs all over his mother, runs around screeching and babbling, touches everything. His poor mother always looks so tired. One of the funniest thing that he does in his fits of temporary insanity is runs into walls. We will be in the middle of a lesson and he will jump out of his mother's lap and runs straight into the wall while screaming. The kicker is that EVERY time he does this, he looks surprised that it hurts. I'm pretty sure most people already learned by a year and a half that slamming yourself into walls hurts. Not this kid. It's a shock every time. His mom and I are hoping that he learns some basic physics one day soon...