Ryan lives next door to Dan, who hates to cut his grass. One day at a neighborhood party, Dan was drunk and angrily said "I will pay anyone $1000 to cut my grass!" The next day, while Dan was at work, Ryan cuts Dan's grass, and ask for payment that night. Dan says no, and Ryan sues him. Who will win the case, and why? What are some arguments that both sides can make? Would your answer change if Dan saw Ryan cutting his grass?