Louise brings Tina along on a mission to find the perfect item for her last ever Show and Tell. Meanwhile, Teddy goes overboard trying to impress a date at the restaurant.
The Show (and Tell) Must Trope On:
- All for Nothing: Louise risks her life looking for a cannonball, and right after she finds one, she loses it trying to get out of the cave before it fills with water. On the plus side, Tina points out that she has an interesting story to tell for show and tell.
- Artistic Licence – Sports: Teddy says the match is Tipperary playing Waterford, but the opposing team are wearing the green and white kit of Limerick, rather than the white and blue of Waterford. (Maybe the match we see is actually a Tipp vs Limerick Minors match before the main game?)
- Big Sister Instinct: Tina is obviously much, much more concerned with getting Louise out of the cave that's filling with water than she is about Louise getting her show-and-tell cannonball.
- Birds of a Feather: Invoked. Teddy attempts to do this for Kathleen by showing off his (absolute lack of) knowledge of hurling, only it's extremely clear he doesn't know a thing, which is fine with Kathleen, because it's fine for two close people to have different interests.
- Call-Back:
- The series premiere featured a scene where Louise presented one of Bob's burgers during show and tell and claimed it was made with human flesh from Mort's crematorium, sparking the episode's conflict. This episode features a montage of Louise's previous show and tells, and one of the clips is this same scene, only updated to fit the show's modern style and featuring recurring characters who hadn't yet debuted.
- When Kathleen points out to Teddy how Bob and Linda have different interests, one of the examples Linda cites is Bob's love of model building.
- The Ditz: Linda believes that cannonballs themselves explode rather than being propelled by gunpowder within the cannon. After Bob explains how cannons work, Linda instead concludes that the cannonballs aren't detonating on purpose as some sort of master plan, leading Bob to ask if she sincerely thinks that 200-year-old cannonballs are not only capable of exploding, but actively waiting to be found so they can explode. She isn't sure.
- Foreshadowing:
- Linda warns Tina and Louise not to go to the caves at the beach or they might drown. They end up going into a cave to look for cannonballs and almost get caught by the rising tide.
- While entering the cave, Louise points out a crevice inside and makes a point to avoid it. Later, as she tries to leave with the cannonball and the water coming in, she tries to throw it across and it falls right into the crevice.
- Plot-Based Voice Cancellation: Gus tries to warn Tina and Louise that the tide is coming in and that they should stay away from the caves or they'll drown, but they're too far away and the sound of the ocean drowns out his voice.
- Rising Water, Rising Tension: Louise and Tina go out to the shore to find an old cannonball from the War of 1812 for show and tell. They wind up finding one in a cave that's below the tide level, but it's partially stuck. Tina panics as the tide rises and comes closer to flooding the cave while Louise remains single-minded in unearthing the cannonball. She eventually succeeds but winds up dropping it down a crevice, and the sisters are forced to leave the cave under threat of drowning.
- Shout-Out:
- The Store Next Door is "Flaming of the Moo".
- The Exterminator Van is "Nice Flies Finish Last".
- Show-and-Tell Antics: The episode revolves around Louise trying to find a perfect item for her fourth-grade show and tell, since it's the last one ever before fifth grade phases them out in favor of social studies. The introduction of this plotline shows a montage of Louise's previous show and tells, with Louise always talking about having something completely outlandish (such as a robot arm or a monkey that can do the Macarena). She tries to get a cannonball from the War of 1812, and while she fails she does manage to put on a presentation about her experience trying to get it (and managed to find a stinky kind of seaweed she intends to sell as a bioweapon).
- The Show Must Go On: The episode title is based on the trope.
- Surprisingly Realistic Outcome: Gene's Big Eater habits bite him back when eating an entire block of cheddar in one sitting lands him with constipation for the bulk of the episode.
