Brown pays you $500 for your barren cow. A non barren cow is worth say $2500. Farmer Brown takes the cow to his farm. Shortly after Farmer Brown informs you that the cow is about to give birth to a calf . You are upset because the calf is worth some real money. Was there a contract? What recourse is any do you have? Are you out of luck? Is there a legal argument that might help you out? What is it?