Do you guys hear that springy sound? I asked my friend who also had a Retina and theirs had it. Is that just a design flaw due to how thin the unibody of the Macbook is? And before you go jumping to conclusions I'm not planning on returning it. I'm just wondering... on an average basis I'll never hear it but when I had it flipped and was checking the lining of my bottom case (due to crackling sounds) I couldn't help but run into that springy sound around that general area.