counterexample

• A scientific theory can be disproved by a single counterexample, but it can never be proved true because that would mean it couldn't be refuted; and - it's faith, not science. —  Libertarian Blog Place
• Until recently public key cryptography arguably provided a counterexample, but quantum computing seems poised to prove Poe right once again.
• Suppose he then mentions the model-T Ford as a counterexample. —  Triablogue
• There is the occasional counterexample, but the generalization holds. —  MSDN Blogs
• As a counterexample of a work that refuses to inoculate its audience, implicating both its audience and itself, one could view Spike Lee's Bamboozled, which depicts the violent side-effects unleashed in the African American community resulting from a televised minstrel show. —  Stories from The Sun

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