Mystery of the Urinal Deuce

Watch this South Park Episode online on South Park Zone
South Park Zone - Season 10 - Episode 1009 - Mystery of the Urinal Deuce
Some info and a short description of this South Park episode on South Park Zone:
South Park - Mystery of the Urinal Deuce is episode 148 of Comedy Central's South Park which first aired on October 11, 2006. This episode focuses on the 9/11 conspiracy theories, which is brought up by Eric Cartman.
Stan and Kyle "discover" the true culprits behind the 9/11 attacks while Mr. Mackey is determined to find out who defecated in the boys' room urinal at South Park Elementary.


South Park Spoiler Alert!
(The complete plot for this South Park Episode)


When someone at South Park Elementary defecates in a urinal, Mr. Mackey searches for the boy responsible. Cartman begins to rant that it was a conspiracy, "just like 9/11", which he had been ranting about for a while. The others, however, simply brush him off, claiming that he, and others that believe in a 9/11 conspiracy, are all "retarded". Meanwhile, Mr. Mackey continues to protest the fact that someone defecated in the urinal, and the rest of the town inexplicably decides the two are probably related. When the police decide they can be of no further help, they hire the Hardly Boys, who investigate the urinal incident by raging clues.
Cartman performs an investigation, which he presents to his class in a presentation where, based on numerological interpretation, he claims that the true culprit behind the 9/11 attacks was Kyle. Cartman believes that Kyle is the culprit, because Kyle got a 91% on his spelling test twelve days after 9/11. Despite the obvious invalidity of Cartman's claims, he nonetheless manages to convince everyone that Kyle is guilty. Kyle tries to rebut this, but nobody listens to him. When Kyle tells his mother that everyone thinks he is the 9/11 culprit, she calls a town meeting, arguing that children do not understand enough about the September 11th attacks. However, many of the townspeople also believe 9/11 might have been the result of a conspiracy.
Kyle enlists Stan's help, and they leave South Park to find an organization that can prove Kyle's innocence. The group they find, however, believes that the United States government orchestrated the 9/11 attacks. The representative that they meet is wearing a 911truth.org T-shirt. The conspiracy organization have bottles of anthrax, which they use as "evidence" of the attack. As Kyle is holding them, a SWAT team attacks and takes Kyle, Stan, and the leader of the conspiracy organization for questioning. They are then taken to the White House. Presidential officials, along with President George W. Bush, quickly admit that the government actually is behind 9/11. Bush explains the incredibly convoluted method of how they pulled the attacks off (essentially a combination of the most common 9/11 conspiracy theories), which seems to greatly dishearten Kyle. Once Bush has admitted this information, he decides to kill Stan, Kyle, and the conspiracy leader, to conceal the conspiracy. The head of the conspiracy group is then executed by Bush. Dick Cheney tries to kill the boys with a crossbow, but misses, and the pair makes their escape. Meanwhile, Clyde is caught for the urinal incident, and while he admits to it, his parents tell Mr. Mackey he had a colostomy at the age of 5.
Later, in Chicago, Stan and Kyle run into the leader of the conspiracy group alive and well outside of a McDonald's. After a short chase by Stan and Kyle, he is cornered in a back alley and shot dead by the father of the Hardly Boys, who reveals that his sons discovered that all the conspiracy websites are false and run by the government. Stan, Kyle, and the Hardly family congregate at the Hardly house as the Bush Administration arrives, and eventually admits that the government was not behind 9/11. He explains that the government actually runs all the websites that claim they were responsible, making the conspiracy theories actually a government conspiracy themselves. The point, Bush explains, is that, since one-fourth of Americans are "retarded" and will believe conspiracies, the government wants them to believe that it is all-powerful and could get away with the worst terrorist attack in history, while they tell the other 75% of the country the truth—that 9/11 was caused (in Stan's words) by "a bunch of pissed off Muslims." Still, the father of the Hardly Boys questions why everyone knew they were at the Hardly house.
And then a gun is put to Kyle's head by his double-crosser. When the camera shifts, it is Stan holding it, tense and desperate. He admits that he was the one who defecated in the urinal, because the stalls were full and he didn't want to miss recess. The whole point of going with Kyle on this strange mission, he explains, was so they could get the "proof" that the government was behind 9/11, and as an extension the urinal incident, which the government was willing to go along with if it made people think they were all-powerful. Thus in the end, the fundamentalists are concluded to be responsible for 9/11, the government admits to Stan, Kyle, and the Hardly family that they wanted people to believe the government was in full control of everything.
Soon after Stan receives his punishment for defecating in the urinal: cleaning the urinal, while Mr. Mackey lectures him (much to Stan's amusement).