*on the way to the Cliffs of Insanity*
Inigo: No one could be following us yet?
Vizzini: No one. It would be inconceivable.
Inigo: Absolutely inconceivable?
Vizzini: Absolutely, totally, and in all other ways, inconceivable. Why do you ask?
Inigo: No reason. Its only that I just happened to look back and something's there.