Millie mows her own yard to save money. Her neighbor Paul, however, hires a lawn service to mow his yard. One day Millie is looking out the window and sees Paul's lawn service drive up. Surprisingly, they begin to mow her yard, not Paul's yard. Millie thinks that is great and keeps her mouth shut while they mow the yard. Later, she gets a bill. She calls the owner of the lawn service and says that she does not have to pay because there was no contract in which she agreed to have her yard mowed. Discuss whether the lawn service is entitled to any recovery and why or why not.