When a deal suddenly falls through, don't get angry or indignant. If the ship is half sunk, blowing off steam will sink it completely. Keep your cool. Remember, you have the right to ask questions. Was there anything wrong with the contract? Were there doubts about the product, service, or you? If there are wrinkles, project confidence that you can address them. Sometimes canceled means just that. But with the right attitude, you can sometimes earn a second chance.