Small town, small class, small faculty - makes it all hard to stay anonymous. Plus there wasn't any formal reporting method that I knew of at the time.
In hindsight, I probably wasn't the only one who might have cottoned on to this. It was purely due to lazy systems administrators. All students were given their student number as their login, and the default password was.... our student number. It was strongly suggested that we change our password after first login, but it was never forced upon us, so not many did change it.
On that lazy day, I simply wondered if the same password 'policy' was in place for our lecturers too, so I guessed that their login might be the unit code, and the password would be the same. In a class full of bright CS wannabes, I am sure a few of the others had the same thought.
No doubt they became aware of this at some stage and that is why it was (thankfully) changed.