Yale law professor Ian Ayres examines two common logical fallacies that show up in legal argument: the ad hominem attack, which discredits a claim by attacking the person making it rather than the substance of what they say, and the slippery slope argument, which warns that accepting one position will inevitably lead to a chain of increasingly extreme consequences. Ayres explains when each move counts as a genuine fallacy versus a legitimate rhetorical or predictive point, using examples drawn from legal reasoning. The lecture is part of Yale's A Law Student's Toolkit, a course designed to introduce the terminology and argumentative tools used by lawyers and legal academics. This entry focuses narrowly on spotting weak reasoning in courtroom and classroom debate, giving viewers a quick way to recognize when an argument is standing on its content or merely on rhetoric.