Original air date: 10/11/2006
Cartman believes he has found the true culprits behind September 11th attacks, while Stan and Kyle seek to uncover the mystery on their own. Meanwhile, another conspiracy erupts in the South Park elementary school.
This episode includes examples of:
- Actually Pretty Funny: The kids initially thought someone taking a crap in the urinal was actually pretty bad, but Mr. Mackey becomes uncharacteristically angry about someone doing so and wanting to find the culprit, constantly ranting about it and using elaborate scatological euphemisms and descriptions on how they would go about doing it just causes the students to laugh hysterically, frustrating Mr. Mackey even more.
- Big "WHAT?!": Sheila (completely understandably) yells her "Whatwhatwhat?!" catchphrase when Kyle tells her that his classmates think he's responsible for 9/11.
- Bunny-Ears Lawyer: Believe it or not, the Hardly Boys solve the Case of the Urinal Turd and the Case of the World Trade Center Conspiracy.
- The Case of...: Parodied with the Hardly Boys. A narrator notes the title of their two cases (see above), while a montage refers to other previous cases (such as The Secret of the Lost Tunnel).
- Demonization: Cartman's "research" into 9/11 leads him to conclude who was truly responsible: Kyle.
- Does This Remind You of Anything?: The Hardly Boys getting "raging clues."
- Faking the Dead: George W. Bush "executes" the webmaster of the 9/11 truther website in front of Stan and Kyle as part of the conspiracy. However, he turns up alive on the streets in DC, showing the boys that more is going on.
- Five-Second Foreshadowing: After the Hardly Boys' father explains how the 9/11 truth movement is a government conspiracy, Stan lets out an "Aw, Jesus" in a noticeably disappointed tone. This hints at his true role in the story and how he doesn't want to get found out for taking a crap in the urinal.
- Government Conspiracy: As it turns out, 9/11 wasn't a government conspiracy, but the 9/11 truth movement was. The government did it to make themselves feel more powerful and project an image of omnipotence to the group of people who insist that the government controls and knows everything, and because the conspiracy nuts refused to believe them even when they told the truth.
- Idiot Ball: The kids believe Cartman when he says Kyle was responsible for 9/11, even though Kyle would have been four-years-old by the time of the event. Plus, the day twelve days after 9/11, when Cartman claimed the spelling test was, was a Sunday in 2001.
- Jerkass Has a Point: Played In-Universe, Cartman seems to convince many students about his 9/11 conspiracy theories.
- Lampshade Hanging: Kyle points out that he and Stan got out of the White House pretty easily for a couple of kids pursued by the government itself. This is a hint about the true conspiracy.
- Not So Above It All: Mr. Mackey's scatological euphemisms become so ridiculous that even the girls and Principal Victoria laugh at them.
- Only in It for the Money: Bush's claimed reason for staging 9/11.
- Pooping Where You Shouldn't: A major Plot Point in this episode.
- President Evil: Subverted. Bush tries to portray himself as one to further the grand conspiracy.
- Pretext for War: President Bush and his cabinet try to make it look like 9/11 was this, going as far as to tell Stan and Kyle they did it so they could invade Iraq, monopolize the oil, and get filthy rich.
- The Reveal: 9/11 really was committed by Al-Qaeda, and the government is behind the 9/11 truth movement in order to convince people that they are all-powerful. Also, Stan was the one who shit in the urinal, and the government aided him in covering that up because it could help further their own conspiracy.
- Rewatch Bonus: After learning Stan is working with the government, if you rewatch the episode, you may notice that unlike Kyle, he doesn't question the ridiculousness of the situation and just goes along with things after the feds take them in.
- Serious Business: Mr. Mackey makes such a big deal over the urinal incident. Even the other staff members seem to think it's too ridiculous.
- Skewed Priorities: Mr. Mackey is way too obsessed with finding who pooped in the urinal.
- Spanner in the Works: On their way home, Stan and Kyle bump into the 9/11 conspiracy theorist after just seeing him shot by Bush.
- Take That!: To 9/11 conspiracy theorists.
- This Is Gonna Suck: Mr. Mackey's reaction to Yates wanting to bring in the Hardly Boys to investigate 9/11.
- Truth in Television: The "proofs" put forward by Cartman are Real Life conspiracy theories about 9/11.
- Unusual Euphemism: Mr. Mackey uses several so ridiculous that it undermines his point and prompts laughter from the students and even Principal Victoria.
- Wham Shot: After Bush comes clean with the whole story, Mr. Hardly questions how he knew where to find them. All of a sudden, a gun is pointed at Kyle, and the camera turns to show Stan holding it.
- With Friends Like These...: The other kids buy into Cartman's 9/11 report and begin to fear Kyle.
- You Have GOT to Be Kidding Me!: Kyle is completely flabbergasted that 9/11 was a conspiracy, and he keeps saying "REALLY?!!!" every time Bush explains the truth.
- You Meddling Kids: Once everything is out in the open, Stan bemoans how the Hardly Boys are actually pretty good at solving mysteries.
