After failing to immediately figure out a picture puzzle, forgetting her locker combination, and turning in a piss-poor school project, Lisa fears she's losing her brainpower, and things get worse when Grampa Simpson tells Lisa that she may have the Simpson Gene, which has already made Homer, Bart, and Grampa himself dumber with age. Meanwhile, Jasper Beardley uses the Kwik-E-Mart freezers to cryogenically preserve himself, and Apu deals with the situation the only way he knows how -- by making a profit off it.
!!This episode contains examples of:
* BorrowedCatchphrase / MeaningfulEcho: [[FreudianSlip "Woo-hoo!]] ...[[VerbalBackspace I mean, 'splendid'"]].
* [[invoked]]CriticalResearchFailure: In-universe. After giving an oversimplification of what DNA is, Troy [=McClure=] freezes up when asked what DNA actually ''stands for''.
* GettingCrapPastTheRadar: One of the attractions in the Kwik-E-Mart besides Jasper is the "World's Most Offensive Baseball Cap" with a subtitle "Do you dare to read it?" Rod and Tod Flanders read "Show Me Your --" before Flanders covers their eyes and [[LastSecondWordSwap assures them it says "Tie"]].
** The nudity in this episode (see NakedPeopleAreFunny below)
* HornyVikings: Jasper is fitted with a typical Viking helmet and shield when repurposed as "Frostillicus"
* HumanPopsicle: Jasper tries this in the freezer, becoming "Frostillicus" in the process. He technically does defrost in the future, but it's only a couple of days or so rather than several years when robot wives are "cheap and efficient".
* NakedPeopleAreFunny: Jasper defrosts and leaves the freezer, spoiling Apu's chance to sell him to the Rich Texan (or at least his head). Following this is a gag where the Kwik-E-Mart is remade into a strip joint called the Nud-E-Mart, complete with Apu and Sanjay naked behind a podium and a bike post outside the entrance.
** Kent Brockman's news report about towel snappings features a bare, yellow butt.
* ShoutOut: During her speech to encourage people to use their minds, Lisa describes the works ''Literature/ToKillAMockingbird'', ''Literature/HarrietTheSpy'', and ''Yertle the Turtle'' as great literature.
** Homer, Bart, and Lisa watch a show featuring a montage of buildings exploding and imploding. One of the buildings is a Gothic manor with a gate reading ''[[Creator/EdgarAllanPoe The House of Usher]].''
** The eraser pig made with springs and pushpins is a reference to a similar prop in Matt Groening's ''Life in Hell'' comics.
* StockLateralThinkingPuzzle: The brain teaser that sets off the episode is comparable to one as Lisa tries to figure out what the last symbol in a series of six would be. She even notes that the symbols don't appear to be anything like Egyptian hieroglyphics or any characters of the like. At the end, she finds that the symbols are made of the numbers 1-6 fused together with a mirrored image of each number.