Problem: Arno woke up one morning to see 3 feet of snow on his driveway. He was getting ready to shovel when he saw a truck from Pom's Landscaping pull up to his driveway. The truck started plowing... and in 10 minutes his long driveway was clear. The truck drove away. Arno knew the Pom's usually plowed his neighbor's driveway, but this was Arno's lucky day- free plowing. One week later, Arno received a bill in the mail. He refused to pay, pointing out that he did not ask to be plowed, and he should not have to pay for Pom's mistake in fact. Pom's sued. What result?