I LOVE LUCY EPISODE GUIDE
The Mertzes feel left out when the Ricardos invite only the Munsons, the Baileys, and the Ramseys to a dinner party. Ethel, in particular, has become envious of Lucy's friendship with Betty Ramsey.
Sensing her friend's hurt feelings, Lucy sets up a nice luncheon for the three gals. Still jealous, Ethel barely opens her mouth during the tete-a-tete. But when Betty casually mentions that she was born in Albuquerque, New Mexico, Ethel's hometown, the two women become inseparable.
Now Lucy is jealous of the Betty-Ethel alliance: "Ever since they had lunch here, they've been as thick as thieves. What's so hot all of a sudden about being born in Albuquerque? I could have been born there myself if my parents didn't live in Jamestown!"
When Lucy happens to overhear the tag end of a conversation between Betty and Ethel through the newly installed intercom system (connecting the main house with the Mertzes' guest cottage), she jumps to the conclusion that the pair is planning a surprise housewarming party for the Ricardos and that's why they've been so preoccupied lately.
That night, Lucy convinces Ricky to dress to the nines and to expect a barrage of friends to burst through the door any moment. After hours of idle waiting, no one shows up. Lucy must have been mistaken, and she wimpers to Ricky that they have no friends.
Through the same intercom, Ethel hears Lucy crying and, realizing the problem, hastily organizes a surprise housewarming party.