'''Airdate:''' October 2, 2011

As a hurricane approaches Quahog, Rhode Island, the Griffins prepares for its arrival. In his own attempt to pass the time, Brian decides to use magic mushrooms, to the curiosity of Stewie. As the mushrooms start to take effect on Brian, he begins having hallucinations and cuts his own ear off, thinking it would cease World War II. Stewie tries to help Brian by staying by his side and taking care of him, but Brian's hallucinations begin to consume him and become more disturbing and frightening to the point where he sees Stewie transforming into a hideous demon towering over him before he views himself in a grotesque and hellish world. During his nightmare sequence, Brian is continually attacked by various monsters resembling the Griffins and Quagmire. Fortunately, he eventually snaps out of the effect after Stewie helps him downstairs to drink some water.

The rest of the family tries to pass the time by playing charades and various other games. They are unable to keep themselves entertained and take their anger out on Meg. Having put up with their abuse for years, Meg finally gets the nerve to stand up to them, starting with Chris for being an awful brother to her. When Lois tries to tell Meg that she is simply taking her own problems out on everyone else, Meg brings up her mother's past and tells her that she is far from a good parent. She also tells Lois that when she turns eighteen, she is considering leaving and cutting off all contact with her, breaking Lois's heart. Meg then confronts Peter who, unable to comprehend her insults, thinks that his daughter's argument is amusing until she calls him a "waste of a man."

Within moments, Peter, Lois and Chris turn their abusive criticisms on each other. Peter then runs away to his room crying, leaving Meg and Brian to discuss what just happened. Despite Brian complimenting her for standing up for herself, Meg concludes that her family cannot survive without a "lightning rod" to absorb its dysfunction, and that her putting up with her family's abuse helps keep them together. Brian tells her that she is more mature than her family. She then decides to explain that she was taking her own problems out on everyone, restoring their egos and opinions.

Stewie then breaks the fourth wall by telling the audience about the repercussions of drugs: "Tonight's Family Guy was a very special episode about drug use, but the simple fact is, it's no laughing matter. To learn more about drugs, visit your local library. There's probably a guy behind there who sells drugs."

!!"Seahorse Seashell Party" contains examples of ([[YMMV/FamilyGuyS10E2SeahorseSeashellParty YMMV goes here]]):
* AscendedMeme: In-universe example: "Stewie Just Said That!" immediately explodes on the Twitterverse.
* ButtMonkey: Meg regains this role at the end of the episode.
* CallingTheOldManOut: Meg gives '''spectacular''' ones to Lois and Peter.
* CasualDangerDialog: "I'm cutting off my ear to prevent World War II."
* DarkerAndEdgier: While not as much as the following episode, it actually marks a pivotal moment in the series in which Meg accuses her family of their faults...and then there's Brian's mushroom-fueled nightmare...
* DisneyAcidSequence: Brian has a absolutely terrifying one after eating Mushrooms...
* HeelRealization / MyGodWhatHaveIDone: Lois.
** IgnoredEpiphany: It doesn't stick.
* HeroicSacrifice: Meg decides to regain her role as the family's ButtMonkey in order for the family to not turn against each other.
* HeterosexualLifePartners: Stewie and Brian. It's just adorably heartwarming to watch the former take care of the latter.
* {{Jerkass}}: Peter, Chris, and Lois. What's unique is that, this time, all three are told by Meg how huge Jerkasses they are being (and have been).
* JumpScare: '''"BRIAN!"'''
* MushroomSamba: Brian's hallucinations.
* PetTheDog: Brian telling Meg that she is a strong girl for putting up with her abusive family.
* TheReasonYouSuckSpeech: Meg dishes one to Peter, Lois, and Chris.
* TookALevelInBadass: Meg, for sticking up for herself.
* ShoutOut
** [[WhenHarryMetSally "I faked my orgasms!"]]
** ''Series/TheGoldenGirls'', ''Empty Nest'' and ''Nurses'': This episode aired as part of "Night of the Hurricane," an evening of Seth [=McFarlane=]-produced shows framed around a major hurricane threatening the East Coast, airing back-to-back-to-back. The concept was copied from "Hurricane Saturday," which aired on NBC and featured the three aforementioned situation comedies and their characters dealing with a major hurricane striking Miami-Dade County, Florida.
* SynchroVox: Stewie in one of Brian's hallucinations.
* ThoseTwoGuys: Stewie and Brian.
* VerySpecialEpisode: Parodied at the end by Stewie.
* WhamEpisode
* YankTheDogsChain / StatusQuoIsGod: Meg calls out her father, mother, and brother for treating her like shit...and then winds up being the family's ButtMonkey again.