I always find it amusing that I read Mistborn, Elantris, Way of Kings, and was halfway through Words of Radiance when Hoid said his thing about perfect pitch. Now, I'd read the first chapter of Warbreaker in the back of one of the Mistborn books, and I recognized it. So, as I was reading WoR on my Kindle, I stopped in the middle, downloaded Warbreaker, read it, then went back to WoR. And was very glad of it when I finished.