Logical fallacies
A logical fallacy is an argument based on a false or invalid inference, an incorrectness of reasoning or belief, or just plain old bad logic. Some of the more popular fallacies include ad hominem attacks against the source of an argument ("What do you know, you suck!"), ad misericordiam appeals to pity ("Won’t someone please think of the children!"), red herring, irrelevant arguments to distract from the one at hand ("I’m right because… look, a giant rouge herring!") and petitio principii or begging the question ("There is truth"). By knowing what the different fallacies are, one can take steps to prevent themselves from making them. So, as I only have your best interests in mind, here’s a site on fallacies and rhetoric.