Carlill v Carbolic Smoke Ball Company [1892] EWCA Civ 1 is an English contract law decision by the Court of Appeal, which held an advertisement containing certain terms to get a reward constituted a binding unilateral offer that could be accepted by anyone who performed its terms. It is notable for its treatment of contract and of puffery in advertising, for its curious subject matter associated with medical quackery, and how the influential judges (particularly Lindley and Bowen) developed the law in inventive ways. Carlill is frequently discussed as an introductory contract case, and may often be the first legal case a law student studies in the law of contract. The case concerned a flu remedy called the "carbolic smoke ball". The manufacturer advertised that buyers who found it did not work would be awarded £100, a considerable amount of money at the time. The company was found to have been bound by its advertisement, which was construed as an offer which the buyer, by using the smoke ball, accepted, creating a contract. The Court of Appeal held the essential elements of a contract were all present, including offer and acceptance, consideration and an intention to create legal relations, and rejected a number of defenses, including puffery. Facts The Carbolic Smoke Ball Co. made a product called the "smoke ball" and claimed it to be a cure for influenza and a number of other diseases. (The 1889–1890 pandemic ongoing at the time was estimated to have killed 1 million people, but may have been caused by a coronavirus instead.) The smoke ball was a rubber ball with a tube attached. It was filled with carbolic acid (or phenol). The tube would be inserted into a user's nose and the ball would be squeezed at the bottom to release the vapours. The Company published advertisements in the Pall Mall Gazette and other newspapers on November 13, 1891, claiming that it would pay £100 () to anyone who got sick with influenza after using its product according to the instructions provided with it: Louisa Elizabeth Carlill saw the advertisement, bought one of the balls and used it three times daily for nearly two months until she contracted the flu on 17 January 1892. She claimed £100 from the Carbolic Smoke Ball Company. They ignored two letters from her husband, a solicitor. On a third request for her reward, they replied with an