The feud between Penny and Karen heats up. Karen attends one of Penny's parties and gathers intelligence from Penny's mother Lynda, who explains that she and her husband allow Penny to throw open-invite parties, with the stipulation that they be held at home and under their supervision, so that there are no drugs, alcohol or "shenanigans." Karen uses this information to throw a birthday party of her own, at a childhood friend's beach house, away from parental eyes and thus including alcohol. However, her party is also open to all, meaning that Penny and her friends, as well as Aggie, receive invitations. Penny isn't keen on going, but relents when her friends insist because they'll "look like the bad guys" if they snub Karen.