Some info and a short description of this South Park episode on South Park Zone:
South Park - Casa Bonita is episode 711 of Comedy Central's South Park. It revolves around Eric Cartman's ploys to get to a Mexican restaurant known as Casa Bonita, which is a fairly accurate representation of an actual theme restaurant in Lakewood, Colorado.
Kyle announces that as a birthday treat, his mom is taking him and three of his friends to Casa Bonita. Cartman's initial joy is crushed when Kyle reveals that he has decided to invite Butters instead of Cartman, because of Cartman's bigotry .
Cartman will find a way to get invited, breaking many laws. After he was caught, he is asked if it had been worth it.
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(The complete plot for this South Park Episode)
The episode starts off with Stan Marsh wondering where Kyle is, followed by Eric Cartman saying he hopes he caught a disease and died, with Stan and Kenny reprimanding him. When Kyle arrives he announces that as a birthday treat, his mother is taking him and three of his friends to Casa Bonita. Cartman's initial joy is crushed when Kyle says he is taking Butters instead of Cartman, because of Cartman's bigotry towards Jews and also as reciprocation for Butters inviting Kyle to his birthday party.Cartman decides to prove that he is actually nice, but since kindness is such a foreign concept to him his attempts are unsuccessful. First, he wears a nice sweater, then he consults Jimmy on the topic of being nice, but ends up violently assaulting Jimmy. When Kyle walks by during the altercation, Cartman pretends that the reason for the assault was Jimmy insulting Kyle's mom. Cartman then takes a more diplomatic approach, stating that he understands Kyle's decision, but wishes to remain friends. Kyle is touched, and says that if Butters is for some reason unable to attend, Cartman can. Cartman then begins working to get rid of Butters.
Cartman tricks Butters into thinking that a meteor is about to hit Earth, and arranges for him to go into hiding to escape the disaster; and, with Butters gone, Cartman figures he's set to go to the restaurant with Kyle. He hides Butters into Jimbo's bomb shelter filled with food and water. On Saturday night, everyone is ready to go and Butters has not showed yet. Cartman arrives to give Kyle a birthday present, then minutes later, Stephen and Linda Stotch show up tearfully asking if they have seen Butters. Kyle says that it "doesn't feel right" to go and enjoy himself now that Butters is missing. Kyle decides to postpone the party for a week. The policemen state that they will be checking bomb shelters as well, which is bad news to Cartman. Cartman says that a meteor the size of Wyoming has hit and that the world is filled with radioactive cannibals. Cartman makes Butters wear a cardboard box over his head so he doesn't see that there hasn't been a meteor, saying that the destruction is too terrible for Butters to see. Cartman brings Butters to the abandoned gas station because it looks horrible enough. Cartman then tells Butters that a radioactive cannibal just came and Cartman managed to kill it, but that it bit him so Cartman will turn into one as well. Cartman puts Butters into an abandoned refrigerator; seconds after Cartman leaves, a garbage truck comes and dumps Butters into the city dump. Butters thinks the dump is the remainders of Earth and after finding a dog, they build a "new civilization". While he is doing so, he finds a junkyard woman and thinks she is another survivor, and asks her to help rebuild the civilization. When Butters explains Cartman's story, the woman explains that none of it actually happened: there was no meteor, no-one was killed, and the town has been looking for Butters for over a week. Butters asks the woman for her phone.
During the drive to Casa Bonita, Kyle is slightly suspicious as to whether or not Cartman is really nice when Stan suggests he (Kyle) decides what to do first as it's his birthday, and Cartman says, "What? Fuck Kyle!" and automatically tries to correct his damage by leading everyone into singing "Happy Birthday." When they arrive, Kyle's mother gets a call telling her that Butters was found, and about Cartman's involvement, confirming Kyle's doubts. She and the other boys confront Cartman, notifying him that the police are on their way. Knowing that his entire plan is close to ruin, Cartman escapes and goes through a mad dash through the restaurant to sample every attraction and food in the minute he has left. He is eventually trapped and cornered by the police, the Broflovskis and the boys, and he jumps off the waterfall. They catch up with him floating on his back in the water below. When a police officer explains all the trouble that Cartman's caused and that he's going to be sent to Juvenile Hall for a week, he asks Eric if it had been worth it. Cartman responds dreamily, "....totally,".