he's only laughed a handful of times but tonight i finally captured it on video

<iframe width="420" height="315" src=" frameborder="0" allowfullscreen></iframe>

a few notes:
1) you can hear the pitch in my voice change when i'm talking to him. i swear i don't do that to adults! (on another note, why do we do this?)
2) when i said 'you're disgusting' he had a bit of spit up happening - I don't ACTUALLY think he's disgusting.
3) i don't know why he likes me saying 'baloo' so much. Whatever, I'll take it.
4) "baleine" is French for "whale". Seemed to fit.

Is there a word or sound/noise you make that gets an instant reaction from your LO?