Journey by Stephen Clark  
    to Ridgetown

You put on the disguise and board a spaceship.
    Before take-off, you ask one of the aliens on board, "Is this ship headed for earth?"
    The alien replies, "Yes it is. We're going to wipe out all those earthlings, those scum-sucking humans with their disgusting eyes and noses and all that hair. Those humans -- they're the filth of the universe. The only good human is a dead human. Right?"
Say "Oh, they're not that bad..."
Say "Right! Let's kill 'em all!"