Cartman is certain Heidi can solve the problem to getting them to Mars because she's really smart and really funny. Gerald tries to save himself by reasoning with the Troll Hunter, while Mr. Garrison explores his new found military power.
At the Park County Police Station, citizens of South Park are gathered, fearful for the launch of TrollTrace. Harrison Yates tells everybody to stay calm and calls out his wife Maggie various times throughout his speech. He says they can all get through this by relying on the common decency of the American people and not using TrollTrace. After saying this, everybody freaks out and start to run away. So Harrison says that guess he could have worded that differently.
At the Broflovski Residence, Kyle is sitting on his bed as his mother Sheila shouts at him for running away and taking Ike with him, while he was in timeout. Kyle says he felt bad for him and Sheila says "You felt bad for him?! After the horrible things he said to people online?" Then she said he will be in big trouble that Ike was a sick troll and tell him that he'll just wait until his father Gerald gets home then closes the bedroom door and Kyle waits for a few minutes. Meanwhile, Ike is sitting on a bed all alone in his room as a FaceTime request from Gerald appears on the computer. When Ike gets off of his bed and goes to his computer and Gerald tells Ike that he'll end up like his brother or mom, as Kyle appears next to Ike. When Kyle asks why he trolled, Gerald tells Kyle he trolled because he thought it was funny. He tells them to contact the resident to do something about the situation in Denmark. Sheila comes in and starts yelling, telling them to get off of the computer.
At the SpaceX headquarters, millions are outside the building angrily demanding to go to Mars. An employee tells them they don't have a way to get there yet, but that a girl who is really smart and funny is working on it. Inside, Heidi is standing in front of a whiteboard filled with equations. Cartman asks her if she figured it out yet, Heidi says she doesn’t understand any of it. Cartman encourages her, telling her that girls are smart and funny.
In the background, Elon Musk tells them that they are busy and that they don't see this working out. Cartman pleads for them to give her a chance saying that Heidi is the funniest, smartest girl he knows. Elon Musk says he hasn't heard Heidi say anything funny and Cartman tells him that he has a mental block in his mind that won't let him get over himself. Butters is sitting in a chair and tells them that Heidi is hysterical. Cartman gives him an angry look, jealous once again.
The door opens at the Trolltrace building where the trolls are locked into, as three people enter. Gerald immediately tells them he's not Skankhunt42. They point a gun at the trolls as Lennart Bedrager tells them to remove their clothes. They all do so as they are moved into an another room with a large glass window and they are put in chairs. Gerald pleads and admits he is Skankhunt42, but he is ignored.
At the South Park Church, people gather and pray for forgiveness and peace about their actions online. Kyle enters and tells everybody to take a stand and not allow Denmark to control their way of life. He advises everybody to call the president, many of them let out an annoyed sigh.
At the Pentagon, a general tells President Elect Garrison that the world needs his calm and steady voice. He is told he has phone calls waiting for him, including from his ex-boyfriend Mr. Slave. He answers, gloating a little bit about his newly gained power. Mr. Slave tells him people want Denmark bombed. Mr. Slave starts to provoke him in order to get him to drop the rational facade, telling him he's a pussy and a bitch president to scared to do it. Garrison finally snaps and tells his advisers to bomb Denmark, the others in the room with Mr. Slave start to celebrate.
Back at Space X, Butters goes into the bathroom as Cartman barges in. Cartman tells Butters to back off from Heidi. Butters tells him about girls leave people broken, and their hearts covered in poo. Cartman denies it and says Heidi is really smart and funny.
Back at the Broflovski Residence, Kyle and Ike are on the computer reading a news article about the bombing on Denmark. Sheila comes in and Kyle screams in terror. She threatens him, demanding he not defy her again. After Sheila says when Gerald gets home from Denmark, Kyle and Ike panic.
Gerald is crying as Dildo Shwaggins tells him to get a hold of himself and tries to comfort him. Gerald asks to speak with the person in charge, he is shown and heard saying this through a monitor in a room in the building. Lennart asks for Gerald to be brought over to the conference room.
At SpaceX again, Heidi is perplexed looking at the board. Cartman and Butters both watch, Cartman starts to argue with him after Butters tells him not to feel bad about being used. He tells Cartman about how the boys will be taken underground and milked for their seman and that the only hope for boys is to start over on Mars. Cartman says he is not being tricked and once again that Heidi is the smartest and funniest girl he knows.
At the TrollTrace building, Gerald is trying to apologize as Lennart is eating. Gerald tells him he's not a troll and he misses his family. Lennart tells him that Freja Ollegard's family misses her a lot and Gerald says that he tries to be edgy and push people's perspectives and views. Lennart tells Gerald he's not going to kill him, he sends out the other people in the room and says "Do you want to know what's really funny?"
At the Pentagon, Garrison's advisers ask if he wants to go through with the bombing, and he without consideration agrees to bomb them. He is told Kyle is on the phone, Garrison goes to answer it. Kyle tells Garrison he can't bomb Denmark as Garrison tells Kyle he can't understand the complexities of what is happening. Kyle calls him a "Dipshit Little Puppet" and they start to argue as Kyle throws insults his way. Garrison says he won't bomb Denmark and Kyle again taunts him, Garrison angrily tells everybody to call off the bombing.
Back at SpaceX, Heidi has a flashback of emoji analysis. Heidi asks if the order on the board is out of sequence. The Space X engineers say she could be onto something as Cartman begs her to say "my vagina".
At TrollTrace, Lennart and Gerald are still there, where the former reveals he's not really Danish and that the real reason he started Troll Trace is to set the entire world against each other because, in his words "it's freaking hilarious!", and what Gerald done was on a smaller scale. Gerald, shocked that Lennart would deliberately start World War III, tells him that it's not funny, to which he calls him a pussy for finding his plan funny.
The employees try to enter the locked room with the trolls in it but their access card fails, they struggle to open the door. The rest of them gather in a room, curtains open revealing the trolls. A projector starts counting down and a video starts, as Rick Astley's "Never Gonna Give You Up" starts to play. The employees look in confusion as Dildo says it's impressive. Lennart locks the door to the room Gerald is in as he tries to escape.
Back at the Broflovski Residence, Ike is sitting looking out at the snow as Kyle comes in, telling him it's time. But he says that he doesn't know that he's strong enough to go through with this, but it was the only way now. Ike knows, and Kyle remember to him that he loves him as little brother and Ike says to Kyle that he loves him too as big brother and they're always gonna be brothers forever, then finally Kyle says "Let's, just get it over with." Meanwhile Sheila is sitting in bed reading a book as Ike comes in and says "Suck my balls, you're a fat bitch". This goads Sheila into screaming and then starts to chase him, Kyle points her in the direction to the pantry as they lock her inside of it. Kyle tells her they had no other choice because they must use the computer. Sheila keeps yelling, telling them not to use the computers. Kyle says they must use the computers it's the only thing they can do to save the family. Sheila pounds the door and screams,"You are done! You hear me?! You are both done!"
AV Club gave "Not Funny" a "C+" rating saying: "But that’s only one of many disparate subplots that has to reach some kind of satisfying conclusion in just one more episode’s time. What about the Member Berries? Where the hell did Hillary Clinton go? And like everything else, the Cartman/Heidi relationship still gets steamrolled by “Not Funny”’s dud of an ending. I suppose one could defend it as being slyly metafictional—this idea of everyone’s inability to stay away from the internet leading to all of us getting trolled all the time, even by the show itself. But as I said, that feels like a copout. South Park has proven time and time again that it can do better than the rehashed “gotcha” moment. Hopefully next week’s finale will get away from this conceit, which seems to be turning into the default strategy for the season."
IGN gave "Not Funny" a "8.6" rating saying: "South Park has been pretty darned consistent this season, and "Not Funny" was no exception. This episode defied its title as it lampooned President Garrison, dredged up Mr. Slave, brought Kyle's mom back to her vengeful roots and showcased Ike's potty mouth. Even the troubled Cartman/Heidi storyline picked up quite a bit. The concern is that the season's hot streak won't hold in the finale. Can such a weird, dense season be properly resolved in only one episode? Or is it better to hope that viewers are about to be trolled as hard as Denmark itself?"