Ok, here’s one for you. This is almost too painful to repeat it’s so bad. When I went to college, the university implemented at 4 digit prefix that students would use when dialing from a campus phone so they could charge long distance calls directly to their university bill. With only 9999 numbers allocated to 6000 students, it was comically simple to use a random number and make that long overdue call to mom.

Right. It lasted a month before it was scrapped.

In the town I live, there was an incident a few years ago with a teenager who got access to his mother’s handgun. She had the gun in a gun safe, with a four digit combo. The teen came home every day after school and started brute-forcing the password. 0000, 0001, and so on. He was determined and patient, and it worked.

https://www.pantagraph.com/news/local/crime-and-courts/teen-...