Yale law professor Ian Ayres examines substantive unconscionability as a formation defense to contract enforcement, using Fleet v. U.S. Consumer Council as the anchor case. Part of his American Contract Law series, originally recorded for Coursera, this segment sits within a broader unit on special controls on promissory liability. Ayres walks through how courts weigh contract terms themselves, rather than the bargaining process, when deciding whether a clause is too one-sided to enforce, tying the case back to the doctrinal test for substantive unconscionability. The lecture is short and focused, aimed at students already following the course's sequence on formation defenses, and works best as one piece of that larger structure rather than a freestanding introduction to the topic. Expect close reading of the case facts and Ayres' characteristically direct, classroom-style explanation of the legal standard being applied.