A bit different than wk93, but still connected and a fun story.

Back in high school when it began to digitalize everything, so began our teachers journey with technology. We, as IT class were into these things, but as far as I can say, others in the school including both teachers and students were like cave mans when it came to IT.

Most of them kept the different wifi networks password on the windows desktop, in a file 'wifipassword.txt'. When we were on robotics seminar, we had to use a teacher's laptop. The wifi network was incredibly fast and powerful,, yet so poorly configured that even the configuration page user/pass was the default admin/admin, because the IT admin wasn't the most skilled one.

We got the idea to sell the password of the wifi network to other students. Not much, for about 1 dollar a week. The customer came to us, we took the phone, took note of the MAC address, entered the password, and if the guy were to stop paying every week, we just blacklisted that MAC on the next robotics course.

Went well for months, until a new sysadmin came and immediately found it out, we were almost fired from the school, but my principal realized how awesome this idea was. You may say that we were assholes, and partially that is true, I'd rather say we made use of our knowledge.