There is no general right to change your mind about a contract, and almost everything people believe about a three-day cancellation window is wrong. This article explains the narrow circumstances in which a cancellation right actually exists, the much larger category of contracts that are simply binding, and the practical routes that work when no legal right applies. It follows a hypothetical couple through a timeshare presentation and a gym membership to show where the enforceable rights are and where they are not. It explains the auto-renewal and negative option rules that govern subscriptions, and the design patterns that make cancellation difficult on purpose. It covers the payment-side tools that work when the merchant will not cooperate, and their limits. It closes with the questions to ask before signing anything that renews.