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.
When I posted in this topic there were no other responses, so I gave you the answer. It’s literally the only reason any one ever does this and it’s done in movies to show the air moving if it directly affects the plot.