Why is it in Hollywood movies every time there is a vent or AC unit someone has fixed little ribbons on it? Is that a thing americans do? Why? The vent in this movie is close to the floor in the toilets of a train. This implies someone got on all fours ON THE FLOOR OF A TRAIN’S BATHROOM to stick those ribbons there for a reason i can’t even begin to comprehend.
And usually only in movies where airflow later stops for a plot-related reason. (e.g. the life support has shut off on a space station)
Alao if the airflow atarts because it it bringing in toxic gas, or oxygen that instantly fills a room that was without enough.
Somehow I associate airflow being shut off with a turbine fan slowing and stopping. I guess due to Total Recall and OG Half Life?