As Tyler becomes more and more powerful, he is able to take over Jack's body more and more, and starts flying all over the country to spread the plans of Project Mayhem. Jack becomes irritated because he never sees Tyler anymore, but he sees signs of Tyler's presence everywhere: "And Tyler was never at home, but after a month a few of the space monkeys had Tyler's kiss burned into the back of their hand" (133).
Soon, he starts breaking Tyler's rule not to talk about him, and whether they've seen him. Jack says that they reply, "No, sir. Not hardly, sir. Nobody they know's ever met Tyler Durden. Friends of friends met Tyler Durden, and they founded this chapter of fight clubs, sir. And then they wink at me" (135).
Then, "Is it true, everybody asks. Is Tyler Durden building an army? That's the word. Does Tyler Durden only sleep one hour a night? Rumor has it that Tyler's on the road starting fight clubs all over the country" (135).
Later, Jack gets a clue that his body is doing things out of his own accord, because he realizes that his hands smell like gasoline, when to his knowledge, he has only been at work today. Then he says, "Here, I'm not sure if Tyler is my dream. Or if I am Tyler's dream" (138), but at this point, he's still not completely aware of what is going on. He finds all of Tyler's plane ticket stubs, and starts going everywhere that Tyler went. Eventually, he ends up in a bar, and finds a bartender who reveals who Tyler really is to Jack: (Movie script)
MAN'S VOICE (O.S.)
(from behind Jack)
Welcome back, sir.
Jack whirls, startled -- facing the wounded BARTENDER, who
wears a NECK BRACE, his nose a smashed eggplant.
WOUNDED BARTENDER
How have you been?
JACK
... You know me?
WOUNDED BARTENDER
Is this a test, sir?
JACK
Yes... it's a test.
WOUNDED BARTENDER
You were in here last Thursday night.
JACK
What?
WOUNDED BARTENDER
You were standing right where you are
now, asking how good our security is.
It's tight as a drum.
JACK
Who do you think I am?
WOUNDED BARTENDER
Is this part of the test?
Jack nods slowly. The Bartender holds up his hand, shows
the KISS SCAR on the back of his hand...
WOUNDED BARTENDER
You're the one who did this to me.
You're Mr. Durden, sir. Tyler Durden.
Once Jack realizes that Tyler is really just another version of himself, he goes back to his hotel, where he finds Tyler. Tyler begins to explain things. I don't want to spoil EVERYTHING in the book, so here is an excerpt from the movie script where Tyler explains to Jack about the situation, That Tyler is Jack when Jack is sleeping, and that he doesn't really exist:
JACK
No! This isn't true. We... we were
around other people, together, both
of us...
TYLER
You never talked to me in front of
anyone else.
JACK
Wrong, wrong -- what about the car
crash... the two guys in the backseat?
TYLER
What about them? They're lunatics.
JACK
You took me to the house.
TYLER
The house is rented in your name.
JACK
You have jobs.
TYLER
Night jobs -- while you were sleeping.
JACK
What about Marla?
TYLER
What about Marla?
JACK
She's... you... you're fucking her.
TYLER
Um, well... technically, no.
Jack stands, trying to absorb, feeling ill, trying to find
words, then -- he suddenly FAINTS to the floor, OUT COLD.