I know a guy who went completely insane because of this movie.
He definitely wasn't that great to begin with, but after he watched Fight Club all he did was try and act out everything in the movie. He definitely had a huge boner for Tyler Durden.
He would always get in these retarded discussions about how "Nothing matters, man...we should just do what the fuck we want...totally anarchy, dogg!"
And anytime he borrowed or broke anything of yours, he'd just be like, "dude, it's just material shit. Don't let your shit control you." That only applied to other people's stuff. If you busted up anything of his, he'd hound you about it 24-7.
He flushed his college scholarship down the toilet, and now he sells drugs to underage girls.
Awesome!