- Jack getting a chemical burn on the back of his hand.
- The scene where Jack beats himself up in his boss's office, throwing himself through a glass table. In a startling aversion of Soft Glass, he has huge bloody chunks of it stuck in his arms.
- Tyler getting brutally beaten by Lou, with Tyler...laughing like a madman. And then when Tyler gets back up, he grabs Lou, and spits blood in his face, while still laughing.
- Those gorgeous shots of Robert Paulson's brain hanging out of the back of his head.
- The other members of Project Mayhem chanting his name in an almost religious paean, which spreads to other members around the world. It really hammers home just how much of a powerful, dangerous cult Tyler has created.
- The Narrator managing to escape the conspirators and get to the police with the evidence of their wrongdoings... only to discover that the cops are in on it too?
- And what The Cops were going to do to him. "You said that if anyone ever interferes with Project Mayhem, even you, we gotta get his balls".
- In the Book, it's worse. Jack gets on a bus, sitting at the back for lack of space. He then realized that everyone on that bus has a shaved head, and they all ambush him to castrate him. When the bus gets pulled over by a police car, one of the officers comes on and says "Pleased to finally meet you Mr. Durden. Sorry we have to do this." He narrowly escapes out the window, but the scene is extremely tense.
- This is alluded in the film too. When the Narrator puts Marla on the bus, you can see several silhouettes moving towards her. Given that she later shows up captured by Project Mayhem, the implication is clear.
- Jack threatening his boss with Going Postal is very unsettling.
- Jack and Tyler stealing human fat from a medical waste dump and having the bag burst as they try to carry it over the fence, with Tyler catching the leaking fat with his bare hands. In the book, much of the fat used for soaps actually came from Marla's mother.
- While the idea of being taken over by a persona you accidentally created that wants to destroy civilization as we know it is a manifestation of one or several Primal Fears, the brief flashback of the Narrator on top of the building, and the pure freaking madness that Edward Norton managed to portray was far more chilling and potentially nightmare-inducing than anything Brad Pitt's character came up with, even after the Villainous Breakdown.
- The burned-out car and the Cold Equation of the Narrator's job as a Recall Coordinator.A new car built by my company leaves somewhere travelling at 60 mph. The rear differential locks up. The car crashes and burns with everyone trapped inside. Now, should we initiate a recall? Take the number of vehicles in the field, A. Multiply it by the probable rate of failure, B. Then multiply the result by the average out-of-court settlement, C. A x B x C equals X. If X is less than the cost of a recall, we don't do one.
This must have been what all those people felt like before I filed them as statistics in my reports.
- And then the Narrator's own car accident.
- "Angel Face" getting beaten until he looks like an unrecognizable mass of flesh and bone. Made even worse when you realize Jack is Tyler Durden, and all this time he has been beating up his supposedly best friend.
- It's made more uncomfortable when everyone in Fight Club, who are all usually fine with an epic fight and excited...are instead shown shocked and unsettled. Even Tyler is unsettled and even asks with audible Tranquil Fury "Where'd you go, psycho boy?".
- In the beginning of the movie is a very subtle Call-Forward to the "changeover" discussion, as very brief snapshots of Brad Pitt are spliced into the early scenes for a frame or two, before vanishing. If it's the first time you're watching the movie, you might not even notice they're there. A second watch, armed with the knowledge that these snapshots are Foreshadowing that there is something seriously wrong brewing in the Narrator's mind, becomes completely and abjectly terrifying.
- Tyler's motivational speech to Raymond to convince him to return to schooling... which he does by holding a gun to his head and threatening to track him down and murder him if he doesn't. While the gun is later revealed to have been unloaded, given all the other extreme things Tyler pulls, we have no idea if this threat wasn't genuine.
- It gets worse when you consider that near the end of the film, Tyler has decorated the back of his bedroom door with the IDs of dozens of people, implying that he's threatened a lot more people than Raymond.
- The Fight between Narrator and Durden in the movie. While at this point we know now that Narrator is fighting himself. Some of the shots on security camera shown him throwing himself over things. One scene practically borderlines on the supernatural as it shows Tyler dragging Narrator across the underground parking lot. It cuts to the camera showing nothing dragging him like a ghost was doing it.
- After the big Reveal, we see scenes of the Narrator interacting with Tyler, with Tyler taken out of the scenes. The shot where the Narrator hands the beer bottle to Tyler who isn't there and it loudly smashes on the ground with the Narrator not even flinching is VERY chilling.
- In the book the last few sentences saying that the members of Project Mayhem are still out there and waiting for Tyler's return.
- The fact that Durden's plan succeeds at least partially. Considering that the Fight Club does take down several buildings means that it could be at best a September 11th style aftermath.... at best. At worst it means everyone goes back to the stone age against their will and it won't be pretty for most people.
- "WHOA! WHOAAA! Okay. You are now firing a gun at your imaginary friend near FOUR HUNDRED GALLONS OF NITROGLYCERIN!!"
- Tyler's "You are not special..." monologue to the audience, which is so intense that it causes the soundtrack to skip and the celluloid which the movie is printed on to shake in the projector!
- The Narrator's chase after Tyler when the latter disappears is rather frightening - he goes cross-country to all the places Tyler's been visiting, only to find more of Project Mayhem and more fight clubs, and no trace of Tyler. It's up to the viewer's imagination at this point what Tyler is planning for everyone.
Nightmare Fuel / Fight Club