Homer: America, take a good look at your beloved candidates. They're
       nothing but hideous space reptiles.  [unmasks them]
        [audience gasps in terror]
Kodos: It's true, we are aliens. But what are you going to do about
       it? It's a two-party system; you have to vote for one of us.
        [murmurs]
 Man1: He's right, this is a two-party system.
 Man2: Well, I believe I'll vote for a third-party candidate.
 Kang: Go ahead, throw your vote away.