Stupid people.
People who argue constantly on walki-talkies/headsets.
People who talk about non-show related things on headset during a show.
Follow spot ops who don't listen.
Follow spot ops who can't keep their spots off the front edge of the stage.
Follow spot ops who can't keep their spots off the soft goods/curtains.
Follow spot ops who can't keep their spots still.
Follow spot ops who open their spots before they are even close to their target.
Follow spot ops who give unhelpful descriptions like "it won't turn on" and that's it.
Follow spot ops who manage to find every place they can go where they can't hear the announcements, and then never leave that place.
Stage managers who don't do anything productive.
Stage managers who say "Go...Go..GOOO!!! The lights aren't coming on," as they come on.
Directors who walk on stage with a mic, ask if it's working, then decide to hold the mic at their side, all while the mic is on.
Directors who tell repeatedly to take cues from the stage manager, then yell during rehearsal that the cues aren't happening fast enough or at the right time.