Del hopes to spark up romance with Annie's neurotic friend Cassandra, who plans on lighting a fire of her own - she's a compulsive pyromaniac just of an institution. Meanwhile, Caroline spends a night out on the town ""alone,"" crashing the restaurant where Richard is trying to enjoy a quiet meal and ultimately being forced by him to attend a movie on her own. Meanwhile, Charlie keeps spotting monkeys throughout Manhattan, and becomes convinced they are taking over the city.