Carlill v Carbolic Smoke Ball Co.

Defendant's advertisement said that if a user of its medicinal product got sick after properly using it, Defendant would pay a certain amount to sick person. Plaintiff got sick after using the product and sued for the money.

The offer was similar to a reward (unilateral contract).

performance = acceptance.

notice was properly given to Defendant of performance.

There was consideration:

Defendant got its product used.

Plaintiff was inconvenienced.