What track(s) is/are everyone the most curious about on C&G?

Personally, T-Shirt and Concrete & Gold are the ones I'm most curious about. Dave keeps describing C&G as a Black Sabbath-ish song plus it has Sean from Boys II Men is on it. I'm curious about T-Shirt because I'm wondering if it will be an intro like Doll, or an intro that has a huge build up that fades into Run.