I worked at a movie theater . and yeah . It kinda does bother the staff . Mostly because at my theater the movies were scheduled in such a way that they all started in about a 45 minute window only 8 screens and people sitting through the whole credits messed up the cleaning up timings so we either had to do a halfassed job only picking up the big stuff rather than sweeping as well or we had a ton of people crowding up the lobby because their theater wasn ' t open for seating yet . We couldn ' t do much cleaning while people were in there because we ' d turn on the overhead lights while we were cleaning so we could more easily see what we were doing , and that washes out the screen plus lets you see how gross the theater really is