Probably either the accoustic solo on the the Little things give you away or the neat little interlude that bines Shadow of the Day and What I've Done. There is this neat little sound right at the end of SOTD that is indescribable, but kind of sounds like water sinking down a sink, the few seconds leading up to that are kind of cool to play over and over... and then the little piano playing leading up to What I've done and everything.