I was kinda sad I was an adult when the hacking PBX’s were a thing in the 90’s. I kept up with that culture and those kids were having a great time taking over corporate phone systems and night and socializing. I still have a habit every now and then of picking up a random courtesy phone and finding the paging extension. I know it marks me as a huge nerd but I had a small handheld dtmf tone generator in my pocket everywhere I went up until I got married. I know a lot of default passwords used by systems. Most library PC’s and hotel business centers are depressingly easy to get into to. All due to a fear many tiny techs have of changing a default password.