Here is a concise summary of the provided text:
**The Simpsons: "Not It" (2-Part Episode)**
**Part 1 (27 years ago)**
* The story begins with a young Barney's traumatic encounter with a disturbing clown, Krusty (inspired by Pennywise from IT).
* Homer, as a teenager, befriends a group of outcast kids (Losers Club-esque) who also had encounters with Krusty.
* Together, they investigate and ultimately defeat Krusty using laughter and a clever trick.
**Part 2 (Present day, 27 years later)**
* Krusty returns, prompting the now-grown friends (Homer, Marge, Carl, and others) to reunite and face their fears again.
* Krusty's powers are fueled by an audience's laughter, which are actually possessed souls of missing children.
* The friends overcome their anxieties and, with a sacrifice from the Comic Book Guy, break the curse, freeing the souls and defeating Krusty.
**Epilogue**
* The episode concludes with the friends having saved the day, and a hint at future nightmares courtesy of debating aliens.
Here are the extracted key facts, each with a number and in short sentence form, excluding opinions:
**Part 1: 27 Years Ago**
1. The story begins with a young Barney playing in the living room during heavy rain.
2. Barney's paper boat falls into the sewer.
3. A disturbing clown, Krusto, appears in the sewer.
4. Krusto bites Barney's arm and drags him away.
5. A teenage Homer posts missing person flyers for Barney.
6. Homer meets other boys (implied to be Carl, Comic Book Guy, and others) who have also encountered Krusto.
7. The boys form a "Losers Club" to defeat Krusto.
8. Each boy shares their terrifying encounter with Krusto.
9. The group discovers Krusto's weakness: he can be harmed if they can make him laugh.
10. They successfully defeat Krusto using humor and a trick with bombs.
**Part 2: 27 Years Later**
11. The story jumps 27 years forward, with a new massacre of children occurring.
12. Homer, now an adult, realizes Krusto has returned.
13. Homer's friends from the "Losers Club" have successful careers: Carl (NASA astronaut), Marge (president of a millionaire company), and Comic Book Guy (heavy metal ventriloquist).
14. The friends reunite to defeat Krusto again, except for Marge, who stays behind with her children.
15. Marge's children are hypnotized by a TV, and the Comic Book Guy kidnaps them to protect them from Krusto.
16. The friends navigate sewers to rescue Marge's children and confront Krusto.
17. Krusto presents an audience of possessed souls of missing children to laugh at the friends.
18. The friends overcome their fears and anxieties to weaken Krusto.
19. The Comic Book Guy sacrifices himself to save Marge and break the sign controlling the souls.
20. Krusto loses his powers and disappears after the sign is broken.
21. The friends reflect on their past and present, with Jeff apologizing to Marge for a past lie.