David contracts to hire his laptop computer for a three-week period to Elaine. Unknown to both, the laptop had been struck by lightning and destroyed the day before the contract was formed.

Fiona agrees to sell her Irata computer game-station to Gordon. She knows that Gordon's main interest is in being able to play Witches and Werewolves. Both parties mistakenly believe that the game-station is capable of running that particular game.

Helen and Ian are both law students. Helen contracts to sell Ian, for 40, her virtually unused copy of McBryde. What Ian had in mind was McBryde on Contract. What Helen had in mind was McBryde on Bankruptcy.

How can I advise Elaine, Gordon and Ian?