Sound reasoning is the basis of winning an argument. Logical fallacies undermine arguments. They are a source of enduring fascination and have been studied for at least two-and-a-half millennia. Knowledge of them is useful, both to avoid those used inadvertently by others and even to use a few with intent to deceive. The fascination and the usefulness that they impart, however, should not be allowed to conceal the pleasure that identifying them can give. I take a very broad view of fallacies. Any trick of logic or language that allows a statement or a claim to be passed off as something does not have an admission card to the enclosure reserved for fallacies.