SET PASSWORD /GENERATE
Back in the 80s, VMS had an optional security feature that could prevent users from choosing their own passwords, instead forcing them to choose one from a list of 5 random "generated" passwords. Of course, there was always the possibility the OS could generate a password with a naughty word in it, so there was allegedly a list of words which could not be used.
Source code was on microfiche in those days, so sadly I never was able to add to my vocabulary by finding the de-facto list of forbidden words!