Phil and Claire get into a fight, and Jay and Gloria mediate; Jay regrets a karaoke machine; Cameron gets Mitchell and Luke to help with a fundraising event.
Claire tries to negotiate peace while Phil sneaks off to the spa; Jay's plans horrify Gloria; Cameron unearths some disturbing artifacts while researching.
Phil and Claire decide to swap parenting roles for the day; Jay gives business advice; Cameron's illness leaves Mitchell torn over a pair of in-demand tickets.
Jay wants a quiet birthday, but the family has other plans; Claire and Mitchell get trapped; Phil runs into his old nemesis; Cameron gets into some hot water.
In search of some outdoor fun, the family heads to Wyoming where they try their hands at cattle herding and skeet shooting; Jay gets in a fight with a cowboy.
Mitch and Cam share their intentions to adopt another child with the family, but Lily's desires become cause for concern; Claire and Jay try to prove a point.
Gloria can't stand Jay's growing relationship with Stella; Cameron goes on a fast with some rather terrible timing; Claire tries to teach life lessons.
Meemaw starts a gambling room which turns into a rousing success; Sheldon tries his hand at working the stock market; Missy decides to launch a new business.
Rachel panics during her baby shower, realizing she's unprepared to care for an infant; Monica tries to atone for forgetting to invite Sandra, Rachel's mother.
After Monica's restaurant gets a bad review in the Post, Monica decides to join a cooking class; Chandler wants to make a good impression for a job interview.
Rachel, Ross and Joey get together in a room and figure out that no one was actually going to propose; Mr. Geller walks in on Monica and Chandler having sex.
Monica thinks Chandler is sexually attracted to sea life after he switched the station from porn to the nature channel in order to conceal his sordid viewing.
When Leonard's new relationship starts moving too fast and he finds himself unable to say "no," he turns to Penny for advice; Sheldon tries to cure his ears.
Christmas becomes a stressful time for everyone as Leonard's handsome colleague starts dating Penny and Sheldon pesters the gang with his gift etiquette.
Penny's comment about Wolowitz's love life sends him into a depressed stupor, costing the fighting robot team its most critical member during a big competition.
In order to gain access to the computer lab, Sheldon attempts to form a relationship with a colleague by developing a scientific procedure for making friends.
Penny accidentally stains Sheldon's favorite couch cushion; Leslie and Howard begin dating after a paintball game, and Leslie quickly becomes controlling.
While Penny enters into a romance with one of their friends from the comic book store, Howard and Raj try to help Leonard pick up a woman at a local bar.
The Jokers pretend to be bellhops and need to do and say what they're told while assisting unsuspecting guests to their rooms. The guys give away tickets.
Claire helps Luke cope with the passing of his friend and neighbor Walt; Phil and Alex have some quality father-daughter time; Haley hosts an unapproved party.
Phil takes Haley to his old college, and Claire forces Mitchell and Cameron to take her for a fun night out; Gloria and Jay may have "the talk" with Manny.
Gloria makes Jay step it up for a night of salsa dancing or else; Cameron takes a bet too far; Phil builds a tree house for Luke, but ends up making new friend.