Remove 1 file to show Setup Assitant (along with the movie)?

slooksterpsv

MacTechie17
Now I know there is a way to do this, but you can delete a file on OS X and the next time you reboot, it'll bring up the setup assistant program as if you had reinstalled the entire OS with the system wiped. Does anyone know what file this is that I have to delete?
 
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