When Frasier pondered how to get even with the art gallery that sold him the forged painting, he considered talking about his experience with the art gallery on his radio show. Niles cautioned him that doing so would be slander, and the gallery would sue Frasier for everything he owned. What Niles said about slander was a factual error. A truthful statement is not slander in the eyes of the law. Frasier would have been telling the truth on his show -- the painting the gallery sold him really was a forgery. Therefore, his story about the gallery would not be slander. This means the gallery would lose a slander lawsuit because there was no slander. It would have been impossible for the gallery to sue Frasier for everything he owned.