How do I make a Mac forget it's ever been set up?

Does anyone know how I can make a Mac forget that it's ever been turned on, so that if it were booted up, it would go into the Setup Assistant as if it were new? I remember seeing a page on this on Google, but I can't find it any more.

Zeroing the hard drive means writing zeros to the drive to remove all data (fast erasing just removes the index file, but keeps the data). You can do it in Disk Utility, under Erase > Options.
If you already created the account and you made a mistake in the true name (the one which allows capitals and spaces) you can correct it via the Accounts preferences. If you made a mistake in the user name which is used in the home directory name, you can create a new user, make that one an administrator, and remove the old user.

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