#2: People who complain that the movie is too loud.
As a projectionist, the vast majority of my job is done for me by programming and machines. This includes the sound levels in the auditorium, which adjust to a pre-programmed level when the film begins to roll. The level we actually have our volume set to is a little lower than the supposed industry standard, because we genuinely care about our customers' ear-drums and don't want to blast their heads through the back of the theatre.
This does not, however give certain members of the public the license to come stumbling from said auditorium, clutching their ears and pleading for the volume to be turned down even further. The volume of the show is a part of the immersive experience, and just because your ears are too damn sensitive doesn't mean we should sabotage the enjoyment of the people who like their explosions LOUD!
Would you go to a rock concert and ask the band to keep it down? Would you go to a nightclub and tell the DJ to lower the volume? If you can't hack the noise, go home and watch a cocking DVD, then you can put it on fucking mute if you want to.