Peter is one noisy critter. He has his quiet moments but its pretty much all or nothing. His amplifiers definitely go to "11" - thank you Spinal Tap. No in between. He even makes noise whenever he eats and I have finally pinpointed the sound. Here is the best example we could get on video:
The following is the link to the noise I knew so well as a kid (you have to copy and paste it):
It's a Hoth-hopping Tauntaun from The Empire Strikes Back!
I finally solved the mystery! We call him Tauntaun whenever he does the noise now and Grant, like any jealous older brother, imitates him to a tee.
I couldn't resist sharing this despite how nerdy I must look now. But, if this odd bodily function wasn't enough - just read the post below. I'm all about posting my kids' noises for all to enjoy. And may you all visit soon as these posts barely do the sounds justice. Much better in person.