You know how sometimes you see something and all of a sudden, you never knew you wanted it before, but now it is something you HAVE to have?
Two cases in point:
I humbly submit that a complete a capella version of "Knights of Cydonia" must come into existence. THE UNIVERSE DEMANDS IT. This is the closest thing to it so far, as far as I know:
Okay, this already exists, thanks to those lovely lovely kids at BYU. But I think that it should be a required element of every self-respecting a capella group's repetoire.