I had the good fortune to do my BFA in a brand-new arts building. (They were still installing tiles in September.) This meant we had keycard locks on every single door, which is fantastic: anyone can be given access to just the right doors, keys can be cancelled remotely, nobody needs to be issued a master key unless absolutely necessary, etc.
Many of these doors locked themselves "permanently" at certain times of the day, requiring a special key to open them again. Classrooms locked themselves after their last scheduled class, access to offices closes when the office does, etc. Some bright spark decided to do the same thing backstage, though, and had them on hourly timers (The door would lock itself at 6, then again at 7, then again at 8...), so we had to station an ASM back there with a key just to keep the dressing rooms and stage doors open, or else everything went to hell. It took 6 months for them to get all of the doors sorted out. There wasn't even a clear pattern: this door locks at 6, this one at 6:30, this one at 6:25, and these ones sometime between 6:40 and 6:50 depending on how they're feeling that day...
This same building was wired so that it was impossible to isolate use of the PA system. Ringing the chimes in the lobby meant ringing the chimes in the hallways downstairs, the offices upstairs, the men's toilets on the third floor, the art gallery... The gimmick was that this would allow fine art to seep out of the theatres and concert halls and into the full forum of the university (or something along those lines), in practice it just meant we had grumpy professors showing up in the lobby to yell at us for disturbing their classes. (And rightly so, but yeccccch.)