Angsty password systems. There is only one other technology that makes me this unreasonably angry on a regular basis. Voice-prompt phone systems that do not allow you to use your keypad to enter long strings of numbers. We already have a technology that lets us enter numbers into a phone. It’s called a phone.
Both of these are cases where developers try to bridge the human-computer gap and fail. While their intentions are noble, they don’t take into account a crucial piece of human character. Ingenuity. A stupid password system? I’ll show them. I have a whole stack of Post-its. I’m set. Voice prompts? Not going to deal with that today I’ll cuss and mash zero until I get a human operator.