We arrived 40 minutes early to get the seat we wanted and settled in to the theatre before the movie, "IT," started. The seats quickly filled up and the movie started without issue. Just as we are meeting Pennywise, the villain, for the first time and the music builds up and Pennywise is about to do his first evil act, the movie stops. Lights thrown on and a theatre worker comes in and says "If you have an open seat next to you, you need to move over." The entire room shuffled around to open up more than just single seats for patrons who either arrived 10 minutes late or who asked for the cinema's help in find seats. So unacceptable. I have never had such an unprofessional experience in a cinema. The movie started again and 20 seconds after the movie played, the lights STILL on, we saw Pennywise's first terrible act and the motivation for the ENTIRE movie. Completely took you out of the experience and ruined the immersion for a while afterwards.On top of that, there were two smudges on the screen itself visible throughout the movie whenever a scene would show any light colors. The whole audience should not be punished for the carelessness of a handful of patrons who either showed up late or refused to break up their groups. I have seen cinema workers quietly move with a flashlight to help those who need it, but never have I seen or heard of the theatre stopping a movie right at the first huge reveal, turn on every light, have EVERYONE move, and then leave the lights on through the first major development in the movie.