they call that kind of dancing 'popping and locking' (that's just for anyone that doesn't know that) i just think that kid is really just amazing at freaking out with his body. it blew my mind.
i'm guessing they learn it by watching people? that's how luke did. i think his friend owen showed him a bit. but of course there was always the FIRST person to do it. and we'll never know how they dreamed it up exactly...