Air date: November 12, 2003
When Kyle refuses to invite Cartman to his birthday party and invites Butters instead, Cartman tricks Butters into thinking the world is coming to an end and leaves him at the city dump.
"Casa Bonita" contains examples of:
- Adult Fear: Linda and Stephen (especially the former) are absolutely devastated when Butters goes missing.
- After the End: Cartman fools Butters into believing that the world was destroyed by a meteor, society has crumbled, and roving bands of radioactive cannibals have taken over. For added effect, Butters winds up in a landfill, which is enough to make him think he's in a post-apocalyptic world.
- Aluminum Christmas Trees: The titular restaurant franchise does exist, and its only remaining location really is in Denver. As absurd as it looks, it's depicted with amazing accuracy. 18 years after this episode aired, Trey and Matt would actually buy the last remaining place.
- The Bad Guy Wins: With the authorities on his tail, Cartman still gets to do everything he planned on doing in Casa Bonita in a span of less than a minute. Then when the cops catch him and tell him he's going to juvenile hall for what he did, Cartman says it was Worth It.
- Blatant Lies: Cartman has definitely discriminated against Kyle's Jewish heritage more than once, contrary to his statement.Cartman: Okay, except maybe that one time.
- Bullying the Disabled: Cartman unintentionally invokes this by beating up Jimmy out of "self-defense", lying about the latter having bad-mouthed Kyle.Cartman: [smack] Take that, Jimmy! [smack] And that! And don't you ever talk bad about Kyle again!! Kyle is my friend!!! And next time you say you had sex with his mom, I'm gonna really let you have it! You hear me?! [sees Kyle walk by] Oh, hey Kyle.Kyle: You really think that beating up a handicapped kid is being nice?
- Down in the Dumps: Butters ends up in a garbage dump near the end of the episode, believing it to be the destroyed town.
- Evil Cannot Comprehend Good: Cartman is genuinely perplexed when Kyle informs him wearing a nice sweater is not the same thing as being a nice person.
- Evil Is Petty: Cartman is willing to lock up Butters for a week just so he could can have the opportunity to go to Casa Bonita.
- Exact Words: When Kyle informs the guys his mom can bring three friends, Cartman is ecstatic. Then Kyle says hes not inviting him, since they are not friends.
- Fully Automatic Clip Show: Cartman questions when he's ever ripped on Kyle for being Jewish, which is followed by a solid minute of clips from previous episodes of Cartman doing just that.
- Hypocrite: While Kyle is well within his rights to not invite Cartman to Casa Bonita and say that they're not really friends, he doesn't have the moral ground to be offended that Cartman rips on him for being Jewish when Kyle rips on him every episode for being fat.
- Idiot Ball: Kyle gets a good grasp on it in this episode: After lunch, Cartman talks to Kyle, saying that he was sorry for all the past abuse he had inflicted upon him and saying that he hoped they could still be friends despite the predicament. Kyle, touched and knowing how much Cartman wanted to go to Casa Bonita, says that, if Butters is for some reason unable to go, Cartman can take his place. This, of course, was Cartman's whole plan to get invited, and he begins working to get rid of Butters.
- It's All About Me: Cartman didn't even care about Kyle's birthday or about Butters' safety as long as he gets into Casa Bonita.
- Jerk with a Heart of Jerk: Cartman pulls off (or least attempts to pull off) many Nice Guy acts, which may seem like he's made a HeelFace Turn, though it turns out that the selfish bastard just wanted to go to Casa Bonita.
- "Just Joking" Justification: Cartman does this when he says "fuck Kyle!" after Stan negotiates with him that Kyle should be able to chose what to do first when they arrive at Casa Bonita since it's his birthday.Cartman: So, um, should we go to Black Bart's Cave first or watch the puppet show? I think we should go through Black Bart's Cave right away 'cause, we're gonna wanna do it seven or eight times. And then we'll watch the cliff divers before the puppet show.
Stan: Dude, it's Kyle's birthday. We should do whatever he wants to do.
Cartman: What? Fuck Kyle! (silence) (the others look at him in astonishment) Ha ha, j-just kidding, birthday joke. Of course we'll do whatever Kyle wants. Uh, Happy Birthday, Kyle.
- Karma Houdini: Inverted. While Cartman didn't completely get away with his plan he still manages to enjoy his time at Casa Bonita in the span of a minute. While not feeling any remorse over it.
- Not Using the "Z" Word: Cartman's glorified post-apocalyptic story evolves to include mutated people who fit into the zombie archetype what with their preying on human flesh and transforming whoever they bite into one of them. However, he only ever refers to them as "cannibals."
- Post-Apocalyptic Dog: Parodied, Butters meets a stray dog at the dump and takes him as a companion.
- Super Gullible: Butters believes everything Cartman tells him in this episode and doesn't realize the truth until an employee at the dump explains the situation to him.
- Uninvited to the Party: Kyle is having his birthday at the titular restaurant and refuses to invite Cartman. Cartman then tries to become nicer so Kyle will invite him, and when that fails he manipulates Butters into going missing so he can take his place.
- Vitriolic Best Buds: Cartman invokes this, saying that he and Kyle might not be able to stand each other, but they've still been through a lot together, even if they don't consider themselves friends. He's saying it solely to soften Kyle up, but still...
- Wants a Prize for Basic Decency: Cartman's many attempts at trying to get Kyle to invite him to his birthday party. His first attempt, for example, has him put on a nice sweater.Kyle: That's not being nice. That's putting on a nice sweater.Cartman: I don't understand the difference.Kyle: I know you don't.
- Worth It: Cartman is told by the police he "caused a whole town to panic, alienated his friends, and is now going to juvenile hall for a week", all in the name of going to the eponymous establishment. When asked if it was all worth it, Cartman simply replies "...totally."
- Xanatos Speed Chess: The entire episode. Cartman repeatedly has to react to developments he wasn't expecting, and does a pretty good job of it. Even though it fails at the last minute, he still got what he wanted in the end.