You're not your job. You're not how much money you have in the bank. You're not the car you drive. You're not the contents of your wallet. You're not your fucking Khakis. You're the all-singing, all-dancing crap of the world.
~ Tyler Durden

Tyler Durden is the antagonist of the movie Fight Club. He is the imaginary friend of the narrator (through dissociative identity disorder). Tyler came into existence when the narrator felt he had to change his life, but felt that he couldn't do it by himself. His troubled mind then produced Tyler as his alter ego.

They "met" on an airplane when the narrator was returning from a business trip. Tyler handed him his card. The narrator returned home to discover that his condo had exploded. He had done this himself, during a period when he "became" Tyler. This usually happened whenever he fell asleep.

He called Tyler and met him at Lou's Tavern, where they agreed to live together at Tyler's run-down house on Paper Street, rented in the narrator's name. In the parking lot, they fought each other for the first time, which was the founding of the fight club. Tyler ran a soap factory out of his basement, using the fat he stole from a lyposuction clinic. He had put together an antimaterialistic philosophy which entailed fighting back against the materialistic society.

As the fight club's membership grew, he used it as a platform for his ideas. The fight club eventually evolved into Project Mayhem, a terrorist group that destroyed what Tyler found was wrong about society. When the narrator became aware of Tyler's true nature, he fought back with his mind. The narrator shot himself in the neck, but thought about shooting himself in the head, which killed Tyler.

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