One day Helen's Burmese cat, Smokey, became stuck in a tree.Mike happened to be passing her property when he heard Helen crying.Mike quickly assessed the situation and climbed the tree to rescue Smokey.Helen told Mike how thankful she was.She asked if he lived nearby and Mike said he had nowhere to live.Helen said that he could live in one of her units for $1 per week for the rest of his life (the normal rental value was about $150 per week).Mike immediately agreed and even paid her $1 in advance.As he was about to move in, Helen told him that she had changed her mind.If Mike sued Helen for breach of contract, the court would hold that the consideration of $1 was: