ham and cheese. here s another one, sandwiches and bread. that s about to change in the world of fast food. reporter: be hold the bunless wonder. now you get a taste of it. it s good. i don t miss the bun. reporter: the missing bun, kfc s double down is the talk of the sandwich world, a slab of chicken, special sauce and cheese and bacon and cheese and more sauce. there s no bread. it s a sandwich without bread. reporter: even as it was being tested in markets. a double down sandwich come bow. reporter: became legendary on the web. dissected and serenaded. you ain t got noally buy. reporter: 1380 mill grams of