Portmaster password recovery.
http://portmasters.com/override.html
Login: !root
Password: override
Enter provided sixteen character challenge string into this program:
% gcc -ooverride -lbsd override.c
% ./override
Enter User Challenge: <CHALLENGE>
Response: <RESPONSE>
Login: !root
Password: <RESPONSE>
Set a new password:
Command> set password <NEW PASSWORD>