Forgot your mac admin password? Just want root?
This works on mac OS X Tiger – Snow Leopard
Reboot your mac
When you hear the chime, Hold apple + s (this puts you in single user mode)
Upon reaching the terminal prompt input the following:
mount -uw / rm /var/db/.AppleSetupDone shutdown -r now
What have we done? You’ve deleted the file that tells apple it has completed the inital mac setup! You have now created a new admin account!