Surely this is just an example of a poorly configured system? Almost by definition you'd think 'administrator' commands should only be available to administrators?
This reminds me of experiences in our school computer room in the late 1980s. We had a reasonably number of BBC Bs on a Econet network. Whilst there were various admin commands these were locked down, but a few clever kids in the school wrote various so-called 'crash programs' which could wreak all sorts of havoc. The simple versions simply dropped text (usually abusive) into the keyboard buffer, but the more advanced ones would scramble screens, lock up buffers, play sounds etc.
There was even a virus version which could be released and then silently spread itself from one computer to another causing random crashes. These so enraged the teacher in charge that he permanently closed the computer room - depriving us of BBC related goodies in the mid-1990s.
More constructive versions 'pushed' complete files across the network, and I do remember a synchronised rendition of 'Bones' which was great fun: