Episode - 3F03\\
First Aired - 10/15/1995

Following a day trip to the petting zoo, Lisa begins to realize that the meat she called food was once an animal that was cute and cuddly, so she decides to become a vegetarian, which gets her ridiculed by her friends and family. Meanwhile, Homer sets up his own barbecue after not being invited to one at the Flanders' house (which was strictly a family reunion).
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!!Tropes:
* AntiHumor: Homer uses an extreme amount of lighter fluid on the barbeque, lights it up...and proceeds along with cooking the meat like normal.
* AreWeThereYet: Grampa Simpson asked that while they were on the way to the petting zoo. It was the episode's first line.
* AssimilationAcademy: Lisa twice sets off the school's "Independent Thought Alarm" for her talk about vegetarianism.
-->'''Skinner:''' Uh-oh. Two independent thought alarms in one day. The students are overstimulated. Willie, remove all the colored chalk from the classrooms!
-->'''Willie:''' I warned ya! Didn't I warn ya? That colored chalk was forged by Lucifer himself!
* BaitAndSwitch: PaulMcCartney asked Lisa if she'd like to hear a song. She accepted and Paul... asks Apu to play.
* BrickJoke: Paul mentions that when "Maybe I'm Amazed" is played backwards, it contains a recipe for lentil soup. Sure enough, when the song plays over the credits, listeners will hear the recipe.
* BrokenRecord: "You don't win friends with salad, you don't win friends with salad..."
* ContinuityNod: When Lisa is being mocked by her peers for her vegetarianism, Ralph Wiggum angrily comments that he can't believe [[Recap/TheSimpsonsS4E15ILoveLisa he used to go out with her]].
* CueTheFlyingPigs
-->'''Mr. Burns''': You know, Smithers, I think I'll donate a million dollars to the local orphanage...when pigs fly!
--> [They laugh as the pig sails across the sky before them.]
-->'''Smithers''': Will you be donating that million dollars now, Sir?
-->'''Burns''': Nooo, I'd still prefer not.
* DoesThisRemindYouOfAnything: The episode itself can interpreted as coping with discrimination of nationalities and sexualities. Especially the parts where Homer speaks about how all normal people aren't vegetarians and Apu teaching Lisa about tolerating peoples opinions then influencing them through patience.
* DriveInTheater: Apu can watch drive-in movies from the roof of the Kwik-E-Mart.
* EditedForSyndication: The "You Don't Win Friends With Salad" part is cut in syndication to remove Marge joining in and Lisa protesting, with Marge stating that she was only in the conga line because the song was catchy, not to take sides.
* FalseReassurance: Troy [=McClure=]'s film "Meat and You - Partners in Freedom"
-->'''Troy''': Come on, Jimmy! Let's take a peek at the killing floor.
-->'''Jimmy''': (gasp)
-->'''Troy''': Don't let the name throw you, Jimmy. It's not really a floor, it's more of a steel grating that allows material to sluice through so it can be collected and exported.
* [[FreeTheFrogs Free the Worms]]: Lisa refuses to dissect a worm at biology class.
* GoToYourRoom: Parodied. Homer says this twice to Lisa, once when she decides to go into her room, the second time after Lisa runs away. Homer also says it to Bart once.
* HollywoodToneDeaf: Apu's rendition of "Sgt. Pepper's Lonely Hearts Club Band", although Paul and Linda don't mind.
* HypocriticalHumor: After Homer brings out the roast pig at his barbecue, Chief Wiggum giggles "Haha look at his nose!" For good measure, he leans in close as he says it, giving the viewers a side-by-side view of their respective noses.
* JerkassRealization: Lisa, after some words with Apu and the McCartneys, realizes she was being a jerk and apologizes to Homer.
* KnowNothingKnowItAll: The TropeNamer. Both Lisa and Homer realize something about vegans and carnivores.
* LoopholeAbuse: When asked if she was required to offer a meatless meal option, Lunchlady Doris offers a hot dog bun.
* NotMeThisTime: See WrongNameOutburst.
* NotSoAboveItAll: The episode revolves around Lisa causing a fuss over eating meat and creating a bitter conflict. Marge even has to correct herself when [[WrongNameOutburst she blames Bart out of instinct]].
* RageBreakingPoint: Lisa was mad at Homer for serving meat, but she snaps when when Homer accidentally flips a burger into her face.
-->'''Lisa:''' It's bad enough they're all eating meat. They don't have to rub it in my face. ''(burger lands on her face)''
* SarcasmBlind: When [[AlphaBitch Janie]] asks Lisa if she is going to marry a carrot, Lisa sarcastically says yes. Sherri and Terri thinks that is a confession.
* ShoutOut: Quite a few to Music/TheBeatles once the [=McCartney=]s show up. For instance, Linda tells Lisa "Whenever we're in Springfield, we like to hang out in Apu's garden in the shade.", referencing the song "Octopus' Garden". Paul had first met Apu while the Beatles were in India with the Maharishi in 1968, leading Apu to say "Back then, I was the fifth Beatle", pronouncing "Beatle" as "[[AccentUponTheWrongSyllable Be-At-Tull]]", just like the Eastern cult members from ''Film/{{Help}}''.
** ''Maybe I'm Amazed'' from McCartney's ''Music/McCartney'' is played over the closing credits, with Apu reading a lentil soup recipe backwards and Paul saying: "Oh, by the way, I'm alive.", referencing the [[EpilepticTrees "Paul is dead" theory]].
* SomeAnvilsNeedToBeDropped: Don't push your beliefs on others just because you don't like their beliefs. Be tolerant of others.
* SoapboxSadie: Lisa starts gaining this ethic towards vegetarianism, leading Apu to give AnAesop concerning having ethics without badgering people over them.
* SpecialGuest: Music/PaulMcCartney and his then-wife Linda, who (being incredibly GenreSavvy) only agreed to do appear if they were assured that the character change was a permanent one. Sure enough, Lisa has remained a vegetarian since.
* StartMyOwn: Homer held his own barbecue because he wasn't invited to Flanders'. Flanders asked [[PolitenessJudo if he could go]] and Homer, out of instinct, answered "Yes" right before realizing he destroyed the whole reason he decided to hold a barbecue in the first place.
* StatusQuoIsGod: Averted: Lisa stays a vegetarian throughout the show.
* SubliminalMessaging: Paul claims that if his song "Maybe I'm Amazed" is played backwards, it reveals a recipe for a "really ripping" lentil soup. Indeed, as "Maybe I'm Amazed" plays over the credits, you can hear Paul speaking backwards.
* TakeThat: There's a secret passageway at the Kwik-E-Mart hidden by what looks like a cooler door labeled "non-alcoholic beer". When Lisa asks him what he does when someone orders a non-alcoholic beer, he shows no concern over the possibility of it ever happening.
-->'''Apu:''' You know, it's never come up.
* TellHimImNotSpeakingToHim: After Lisa ruined the barbecue, Homer and Lisa talk like that, but Homer soon gets confused about who he is/isn't talking to.
-->'''Homer:''' Marge? Since I'm not talking to ''Lisa'', would you please ask her to pass me the syrup?
-->'''Marge:''' Dear, please pass your father the syrup, Lisa.
-->'''Lisa:''' Bart, tell Dad I will only pass the syrup if it won't be used on any meat product.
-->'''Bart:''' You dunkin' your sausages in that syrup, homeboy?
-->'''Homer:''' Marge, tell ''Bart'' I just want to drink a nice glass of syrup like I do every morning.
-->'''Marge:''' Tell him yourself, you're ignoring Lisa, not Bart.
-->'''Homer:''' Bart, thank your mother for pointing that out.
-->'''Marge:''' Homer, you're not not-talking to me, and secondly, I heard what you said.
-->'''Homer:''' Lisa, tell your mother to get off my case!
-->'''Bart:''' Uhhh, Dad. Lisa's the one you're not talking to.
* TemptingFate: Marge tries to reassure Lisa and Grampa the place they're going will be fun for all ages from eight to whatever Grampa's age is. When they arrive, there's a sign stating the place to be for ages from one to seven and a half. Later, when Lisa comments that the people at the barbecue don't need to rub it in her face, a burger falls on her face.
* UncannyFamilyResemblance: All the men in Ned Flanders' family reunion look like Ned (including a Mexican Ned and a stuffy British Ned).
* WrongNameOutburst: Marge, when it's Lisa who is doing something bad for a change.
-->'''Marge:''' Bart, nooooo!
-->'''Bart:''' What?
-->'''Marge:''' Sorry, force of habit. Lisa, nooooo!
* YouMustBeThisTallToRide: This short, in this case.