I can't believe I forgot about the Dress Code Police! There is one woman in my office who runs around telling people they're inappropriately dressed (our dress code is business casual). I overheard her yesterday talking to two women, telling one of them her skirt was too short (I think it fell just above the knee) and asking the other, "Those aren't jeans, are they?"
At a previous job, we had the IT department from hell. If there were software packages or upgrades to install, they wouldn't go up to people and say "I need to install X on your computer, it'll take five minutes, can I do it now or should I come back later?" They would wait until people stepped away from their desks, and then just go and install, and if the computer had to be rebooted and the user lost their data, what did they care.